WO2021060916A1 - Procédé d'émission et de réception de signaux pour l'exécution d'un procédé d'accès aléatoire dans une bande sans licence, et appareil associé - Google Patents

Procédé d'émission et de réception de signaux pour l'exécution d'un procédé d'accès aléatoire dans une bande sans licence, et appareil associé Download PDF

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Publication number
WO2021060916A1
WO2021060916A1 PCT/KR2020/013074 KR2020013074W WO2021060916A1 WO 2021060916 A1 WO2021060916 A1 WO 2021060916A1 KR 2020013074 W KR2020013074 W KR 2020013074W WO 2021060916 A1 WO2021060916 A1 WO 2021060916A1
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Prior art keywords
transmission
msg
uplink signal
channel
base station
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PCT/KR2020/013074
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English (en)
Korean (ko)
Inventor
이정수
윤석현
고현수
양석철
김선욱
이영대
신석민
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to CN202080067430.9A priority Critical patent/CN114531969A/zh
Priority to EP20869904.1A priority patent/EP4050960A4/fr
Priority to KR1020227013779A priority patent/KR102557584B1/ko
Publication of WO2021060916A1 publication Critical patent/WO2021060916A1/fr
Priority to US17/704,868 priority patent/US11638310B2/en
Priority to US18/166,850 priority patent/US11844118B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/50—TPC being performed in particular situations at the moment of starting communication in a multiple access environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/004—Transmission of channel access control information in the uplink, i.e. towards network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0866—Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution

Definitions

  • the present disclosure relates to a method for transmitting and receiving a signal for a terminal to perform a random access process in an unlicensed band and an apparatus therefor, and more particularly, to a signal for a terminal to perform a 2-step random access process in an unlicensed band. It relates to a method of transmitting and receiving and an apparatus therefor.
  • next-generation communications which provides a variety of services anytime, anywhere by connecting multiple devices and objects, is one of the major issues to be considered in next-generation communications.
  • MTC massive Machine Type Communications
  • a communication system design considering a service/ sensitive to reliability and latency is being discussed.
  • eMBB enhanced mobile broadband communication
  • mMTC massive MTC
  • URLLC ultra-reliable and low latency communication
  • the present disclosure is to provide a method and apparatus for transmitting and receiving a signal for performing a two-step random access process.
  • a synchronization signal/physical broadcast channel block (SS/PBCH) is received from a base station And obtaining system information from the PBCH included in the SS/PBCH block, and an uplink signal including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH) based on the system information
  • PRACH physical random access channel
  • PUSCH physical uplink shared channel
  • a downlink signal related to contention resolution from the base station in response to the uplink signal and the transmission power of the uplink signal is determined by a power ramping counter (ramping). counter), and the value of the power ramping counter is the same as the transmission spatial beam for transmission of the uplink signal and the transmission spatial beam related to transmission of the PRACH before the uplink signal. It can be increased based on what is constructed.
  • the value of the power ramping counter may be increased based on the fact that the Listen Before Talk (LBT) for the uplink signal has not failed.
  • LBT Listen Before Talk
  • transmission of the uplink signal may correspond to retransmission of the uplink signal.
  • LBT Listen Before Talk
  • the value of the power ramping counter may not increase.
  • the power ramping counter may be used to set the transmission power based on the fact that the first PRACH and the first PUSCH are transmitted together through the uplink signal.
  • a terminal for performing a random access channel procedure (RACH Procedure) in an unlicensed band comprising: at least one transceiver; At least one processor; And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed, wherein the specific operation includes: SS /PBCH block (Synchronization Signal/Physical Broadcast Channel Block) is received from the base station, system information is obtained from the PBCH included in the SS/PBCH block, and based on the system information, a first PRACH (Physical Random Access Channel) And transmitting an uplink signal including a first PUSCH (Physical Uplink Shared Channel) to the base station, and receiving a downlink signal related to contention resolution from the base station in response to the uplink signal.
  • SS /PBCH block SynchronitiModet Access Signal/Physical Broadcast Channel Block
  • system information is obtained from the PBCH included in the SS/PBCH block
  • the transmission power of the uplink signal is set based on a power ramping counter, and the value of the power ramping counter is a transmission spatial beam for transmission of the uplink signal. It may increase based on the fact that the transmission spatial beam related to transmission of the PRACH before the uplink signal is configured in the same manner.
  • the value of the power ramping counter may be increased based on the fact that the Listen Before Talk (LBT) for the uplink signal has not failed.
  • LBT Listen Before Talk
  • transmission of the uplink signal may correspond to retransmission of the uplink signal.
  • LBT Listen Before Talk
  • the value of the power ramping counter may not increase.
  • the power ramping counter may be used to set the transmission power based on the fact that the first PRACH and the first PUSCH are transmitted together through the uplink signal.
  • An apparatus for performing a random access channel procedure (RACH Procedure) in an unlicensed band comprising: at least one transceiver; At least one processor; And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed, wherein the specific operation includes: SS /PBCH block (Synchronization Signal/Physical Broadcast Channel Block) is received, system information is obtained from the PBCH included in the SS/PBCH block, and based on the system information, a first PRACH (Physical Random Access Channel) and a 1 Transmitting an uplink signal including a physical uplink shared channel (PUSCH), and receiving a downlink signal related to contention resolution in response to the uplink signal, and The transmission power is set based on a power ramping counter, and the value of the power ramping counter is a transmission spatial beam for transmission of the uplink signal and transmission of the PRACH before the uplink signal. It can be increased based on the
  • the SS/PBCH block Synchronization Signal/Physical Broadcast Channel Block
  • receiving an uplink signal including a first PRACH (Physical Random Access Channel) and a first PUSCH (Physical Uplink Shared Channel) from the terminal in response to the uplink signal, contention resolution It includes transmitting a related downlink signal to the terminal, and the transmission power of the uplink signal is set based on a power ramping counter, and the value of the power ramping counter is set to transmit the uplink signal.
  • the transmission spatial beam for the uplink signal may be increased based on the fact that it is configured identically to the transmission spatial beam related to transmission of the PRACH before the uplink signal.
  • the computer-readable storage medium when executed by at least one processor, provides instructions for causing the at least one processor to perform operations for a user device.
  • Stores at least one computer program including, and the operations include receiving a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH), obtaining system information from the PBCH included in the SS/PBCH block, and the system Based on the information, transmits an uplink signal including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH), and in response to the uplink signal, contention resolution Including receiving a related downlink signal, the transmission power of the uplink signal is set based on a power ramping counter, and the value of the power ramping counter is a transmission space for transmission of the uplink signal A transmission spatial beam may be increased based on the fact that the transmission spatial beam is configured identically to a transmission spatial beam related to transmission of a PRACH before the uplink signal.
  • SS/PBCH Synchronization Signal/Physical Broadcast Channel Block
  • a terminal in a wireless communication system, can smoothly transmit and receive a signal for performing a 2-step random access process.
  • FIG. 1 is a diagram illustrating an example of an NR system network architecture.
  • FIG. 2 shows an example of a wireless communication environment to which embodiments of the present invention can be applied.
  • FIG. 3 is a diagram showing a structure of a control plane and a user plane of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • FIG. 4 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using them.
  • 5 is a diagram for explaining an embodiment of a procedure for controlling uplink transmission power.
  • 6 to 11 are diagrams for explaining a composition and a transmission method of an SS/PBCH block.
  • 12 to 14 are diagrams for explaining channel transmission in an unlicensed band.
  • 15 is a diagram illustrating an example of a random access procedure.
  • 16 to 17 are diagrams for explaining an example of implementing specific operations of a terminal and a base station according to an embodiment of the present disclosure.
  • FIG. 18 is a diagram showing a basic process of a 2-step RACH.
  • FIG. 19 is a diagram illustrating an embodiment of transmission of Msg A according to whether a terminal succeeds or fails in an LBT and a configuration of a transmission beam direction.
  • 20 is a diagram illustrating an embodiment of the present disclosure in which a power ramping counter is maintained or increased according to a transmission beam direction of a terminal.
  • 21 is a diagram illustrating an operation flow of a terminal and a base station for performing a 2-step RACH procedure based on embodiments of the present disclosure.
  • 22 to 25 illustrate examples of various wireless devices to which embodiments of the present disclosure are applied.
  • the name of the base station may be used as a generic term including a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a relay, and the like.
  • RRH remote radio head
  • TP transmission point
  • RP reception point
  • relay a relay
  • 3GPP-based communication standards include downlink physical channels corresponding to resource elements carrying information originating from higher layers, and downlink corresponding to resource elements used by the physical layer but not carrying information originating from higher layers.
  • Physical signals are defined.
  • PBCH physical broadcast channel
  • PMCH physical multicast channel
  • PHICH physical control format indicator channel
  • PHICH physical hybrid ARQ indicator channel
  • a reference signal also referred to as a pilot, refers to a signal of a predefined special waveform that the gNB and the UE know each other.
  • cell specific RS RS
  • UE-specific RS UE-specific RS
  • UE-RS positioning RS
  • channel state information RS channel state information RS, CSI-RS
  • 3GPP LTE/LTE-A standard corresponds to uplink physical channels corresponding to resource elements carrying information originating from an upper layer, and resource elements used by the physical layer but not carrying information originating from an upper layer. Uplink physical signals are defined.
  • a physical uplink shared channel PUSCH
  • a physical uplink control channel PUCCH
  • a physical random access channel PRACH
  • DMRS demodulation reference signal
  • SRS sounding reference signal
  • PDCCH Physical Downlink Control CHannel
  • PCFICH Physical Control Format Indicator CHannel
  • PHICH Physical Hybrid automatic retransmit request Indicator CHannel
  • PDSCH Physical Downlink Shared CHannel
  • DCI Downlink Control Information
  • CFI Control Format Indicator
  • Downlink ACK / NACK ACKnowlegement / Negative ACK
  • Uplink Shared CHannel/PRACH Physical Random Access CHannel refers to a set of time-frequency resources or a set of resource elements each carrying uplink control information (UCI)/uplink data/random access signals.
  • PDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH assigned to or belonging to a time-frequency resource or resource element (RE), respectively, PDCCH/PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH RE or PDCCH It is referred to as /PCFICH/PHICH/PDSCH/PUCCH/PUSCH/PRACH resource.
  • the expression that the user equipment transmits PUCCH/PUSCH/PRACH is, respectively, uplink control information/uplink data on or through PUSCH/PUCCH/PRACH.
  • /It is used in the same meaning as that of transmitting a random access signal.
  • the expression that gNB transmits PDCCH/PCFICH/PHICH/PDSCH is, respectively, on PDCCH/PCFICH/PHICH/PDSCH. It is used in the same meaning as transmitting downlink data/control information through or through.
  • CRS/DMRS/CSI-RS/SRS/UE-RS are allocated or configured OFDM symbols/subcarriers/REs are CRS/DMRS/CSI-RS/SRS/UE-RS symbols/carriers. It is called /subcarrier/RE.
  • an OFDM symbol to which a tracking RS (TRS) is allocated or configured is referred to as a TRS symbol
  • a subcarrier to which a TRS is allocated or configured is referred to as a TRS subcarrier
  • a TRS is allocated.
  • the configured RE is referred to as TRS RE.
  • a subframe configured for TRS transmission is referred to as a TRS subframe.
  • a subframe in which a broadcast signal is transmitted is called a broadcast subframe or a PBCH subframe
  • a subframe in which a synchronization signal (eg, PSS and/or SSS) is transmitted is a synchronization signal subframe or a PSS/SSS subframe. It is called.
  • the OFDM symbols/subcarriers/REs to which PSS/SSS are allocated or configured are referred to as PSS/SSS symbols/subcarriers/REs, respectively.
  • a CRS port, a UE-RS port, a CSI-RS port, and a TRS port respectively refer to an antenna port configured to transmit a CRS, an antenna port configured to transmit a UE-RS, Refers to an antenna port configured to transmit CSI-RS and an antenna port configured to transmit TRS.
  • the antenna ports configured to transmit CRSs can be classified according to the positions of the REs occupied by the CRS according to the CRS ports, and the antenna ports configured to transmit UE-RSs are the UE -According to the RS ports, the positions of the REs occupied by the UE-RS can be distinguished from each other, and the antenna ports configured to transmit CSI-RSs are occupied by the CSI-RS according to the CSI-RS ports. It can be distinguished from each other by the location of the REs. Therefore, the term CRS/UE-RS/CSI-RS/TRS port is also used as a term that refers to a pattern of REs occupied by CRS/UE-RS/CSI-RS/TRS within a certain resource area.
  • FIG. 1 is a diagram showing an example of an NR system network architecture.
  • the network of the NR system is largely composed of a next generation radio access network (NG-RAN) and a next generation core (NGC) network.
  • NG-RAN next generation radio access network
  • NGC next generation core
  • 5GC 5GC
  • the NG-RAN terminates user plane protocols (e.g., SDAP, PDCP, RLC, MAC, PHY) and control plane protocols (e.g., RRC, PDCP, RLC, MAC, PHY) for the UE.
  • user plane protocols e.g., SDAP, PDCP, RLC, MAC, PHY
  • control plane protocols e.g., RRC, PDCP, RLC, MAC, PHY
  • RRC Access and Mobility Management function
  • the interface is connected to a core network node with a user plane function (UPF).
  • AMF and UPF may be implemented by different core network devices, respectively, or may be implemented by one core network device.
  • transmission/reception of signals between the BS and the UE is performed through the air interface.
  • transmission/reception of a signal between a BS and a UE in the RAN is performed through physical resources (eg, radio frequency (RF)).
  • RF radio frequency
  • the transmission/reception of signals between the gNB and network functions (eg, AMF, UPF) in the core network is not a wireless interface, but a physical connection between core network nodes (eg, optical cable) or a logical connection between core network functions. It can be done through
  • FIG. 2 illustrates a communication system 1 applied to the present invention.
  • a communication system 1 applied to the present invention includes a wireless device, a base station, and a network.
  • the wireless device refers to a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device.
  • wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400.
  • the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing inter-vehicle communication, and the like.
  • the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone).
  • UAV Unmanned Aerial Vehicle
  • XR devices include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, and include HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone It can be implemented in the form of a computer, a wearable device, a home appliance, a digital signage, a vehicle, a robot, and the like.
  • Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.).
  • Home appliances may include TVs, refrigerators, washing machines, and the like.
  • IoT devices may include sensors, smart meters, and the like.
  • the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to other wireless devices.
  • the wireless devices 100a to 100f may be connected to the network 300 through the base station 200.
  • AI Artificial Intelligence
  • the network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network.
  • the wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may communicate directly (e.g. sidelink communication) without passing through the base station/network.
  • the vehicles 100b-1 and 100b-2 may perform direct communication (e.g.
  • V2V Vehicle to Vehicle
  • V2X Vehicle to Everything
  • the IoT device eg, sensor
  • the IoT device may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.
  • Wireless communication/connections 150a, 150b, and 150c may be established between the wireless devices 100a to 100f/base station 200, and the base station 200/base station 200.
  • wireless communication/connection includes various wireless access such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR)
  • the wireless communication/connection 150a, 150b, 150c can transmit/receive radio signals to each other.
  • the wireless communication/connection 150a, 150b, 150c can transmit/receive signals through various physical channels.
  • At least some of a process of setting various configuration information various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation process, and the like may be performed.
  • various signal processing processes eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.
  • resource allocation process e.g., resource allocation process, and the like.
  • the three main requirements areas of 5G are (1) Enhanced Mobile Broadband (eMBB) area, (2) Massive Machine Type Communication (mMTC) area, and (3) Ultra-reliability and It includes a low-latency communication (Ultra-reliable and Low Latency Communications, URLLC) area.
  • eMBB Enhanced Mobile Broadband
  • mMTC Massive Machine Type Communication
  • URLLC Low Latency Communications
  • KPI key performance indicator
  • eMBB goes far beyond basic mobile Internet access and covers rich interactive work, media and entertainment applications in the cloud or augmented reality.
  • Data is one of the key drivers of 5G, and it may not be possible to see dedicated voice services for the first time in the 5G era.
  • voice is expected to be processed as an application program simply using the data connection provided by the communication system.
  • the main reasons for the increased traffic volume are an increase in content size and an increase in the number of applications requiring high data rates.
  • Streaming services (audio and video), interactive video and mobile Internet connections will become more widely used as more devices connect to the Internet. Many of these applications require always-on connectivity to push real-time information and notifications to the user.
  • Cloud storage and applications are increasing rapidly on mobile communication platforms, which can be applied to both work and entertainment.
  • cloud storage is a special use case that drives the growth of the uplink data rate.
  • 5G is also used for remote work in the cloud and requires much lower end-to-end latency to maintain a good user experience when tactile interfaces are used.
  • Entertainment For example, cloud gaming and video streaming is another key factor that is increasing the demand for mobile broadband capabilities. Entertainment is essential on smartphones and tablets anywhere, including high mobility environments such as trains, cars and airplanes.
  • Another use case is augmented reality and information retrieval for entertainment.
  • augmented reality requires very low latency and an instantaneous amount of data.
  • one of the most anticipated 5G use cases relates to the ability to seamlessly connect embedded sensors in all fields, i.e. mMTC.
  • mMTC massive machine type computer
  • Industrial IoT is one of the areas where 5G plays a major role in enabling smart cities, asset tracking, smart utilities, agriculture and security infrastructure.
  • URLLC includes new services that will transform the industry with ultra-reliable/low-latency links such as self-driving vehicles and remote control of critical infrastructure.
  • the level of reliability and delay is essential for smart grid control, industrial automation, robotics, and drone control and coordination.
  • 5G can complement fiber-to-the-home (FTTH) and cable-based broadband (or DOCSIS) as a means of providing streams rated at hundreds of megabits per second to gigabits per second. This high speed is required to deliver TVs in 4K or higher (6K, 8K and higher) resolutions, as well as virtual and augmented reality.
  • Virtual Reality (VR) and Augmented Reality (AR) applications involve almost immersive sports events.
  • Certain application programs may require special network settings. For example, for VR games, game companies may need to integrate core servers with network operators' edge network servers to minimize latency.
  • Automotive is expected to be an important new driving force in 5G, with many use cases for mobile communication to vehicles. For example, entertainment for passengers demands simultaneous high capacity and high mobility mobile broadband. The reason is that future users will continue to expect high-quality connections, regardless of their location and speed.
  • Another use case in the automotive field is an augmented reality dashboard. It identifies an object in the dark on top of what the driver sees through the front window, and displays information that tells the driver about the distance and movement of the object overlaid.
  • wireless modules enable communication between vehicles, exchange of information between the vehicle and the supporting infrastructure, and exchange of information between the vehicle and other connected devices (eg, devices carried by pedestrians).
  • the safety system can lower the risk of an accident by guiding the driver through alternative courses of action to make driving safer.
  • the next step will be a remote controlled or self-driven vehicle.
  • This requires very reliable and very fast communication between different self-driving vehicles and between the vehicle and the infrastructure.
  • self-driving vehicles will perform all driving activities, and drivers will be forced to focus only on traffic anomalies that the vehicle itself cannot identify.
  • the technical requirements of self-driving vehicles require ultra-low latency and ultra-fast reliability to increase traffic safety to levels unachievable by humans.
  • Smart cities and smart homes referred to as smart society, will be embedded with high-density wireless sensor networks.
  • a distributed network of intelligent sensors will identify the conditions for cost and energy-efficient maintenance of a city or home.
  • a similar setup can be done for each household.
  • Temperature sensors, window and heating controllers, burglar alarms and appliances are all wirelessly connected. Many of these sensors are typically low data rate, low power and low cost. However, for example, real-time HD video may be required in certain types of devices for surveillance.
  • the consumption and distribution of energy including heat or gas is highly decentralized, requiring automated control of distributed sensor networks.
  • the smart grid interconnects these sensors using digital information and communication technologies to gather information and act accordingly. This information can include the behavior of suppliers and consumers, enabling smart grids to improve efficiency, reliability, economics, sustainability of production and the distribution of fuels such as electricity in an automated way.
  • the smart grid can also be viewed as another low-latency sensor network.
  • the health sector has many applications that can benefit from mobile communications.
  • the communication system can support telemedicine providing clinical care from remote locations. This can help reduce barriers to distance and improve access to medical services that are not consistently available in remote rural areas. It is also used to save lives in critical care and emergencies.
  • a wireless sensor network based on mobile communication can provide sensors and remote monitoring of parameters such as heart rate and blood pressure.
  • Wireless and mobile communications are becoming increasingly important in industrial applications. Wiring is expensive to install and maintain. Thus, the possibility of replacing cables with reconfigurable wireless links is an attractive opportunity for many industries. However, achieving this requires that the wireless connection operates with a delay, reliability and capacity similar to that of the cable, and its management is simplified. Low latency and very low error probability are new requirements that need to be connected to 5G.
  • Logistics and freight tracking are important use cases for mobile communications that enable tracking of inventory and packages anywhere using location-based information systems. Logistics and freight tracking use cases typically require low data rates, but require a wide range and reliable location information.
  • FIG. 3 is a diagram showing a structure of a control plane and a user plane of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.
  • the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
  • the user plane refers to a path through which data generated in the application layer, for example, voice data or Internet packet data, is transmitted.
  • the first layer provides an information transfer service to an upper layer using a physical channel.
  • the physical layer is connected to the upper medium access control layer through a transmission channel. Data moves between the medium access control layer and the physical layer through the transmission channel. Data moves between the physical layers of the transmitting side and the receiving side through a physical channel.
  • the physical channel uses time and frequency as radio resources. Specifically, a physical channel is modulated in an Orthogonal Frequency Division Multiple Access (OFDMA) scheme in downlink and a single carrier frequency division multiple access (SC-FDMA) scheme in uplink.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA single carrier frequency division multiple access
  • the medium access control (MAC) layer of the second layer provides a service to an upper layer, the Radio Link Control (RLC) layer, through a logical channel.
  • the RLC layer of the second layer supports reliable data transmission.
  • the function of the RLC layer may be implemented as a functional block inside the MAC.
  • the PDCP (Packet Data Convergence Protocol) layer of the second layer performs a header compression function that reduces unnecessary control information in order to efficiently transmit IP packets such as IPv4 or IPv6 over a narrow bandwidth wireless interface.
  • the radio resource control (RRC) layer located at the bottom of the third layer is defined only in the control plane.
  • the RRC layer is in charge of controlling logical channels, transmission channels, and physical channels in relation to configuration, re-configuration, and release of radio bearers.
  • the radio bearer refers to a service provided by the second layer for data transmission between the terminal and the network.
  • the UE and the RRC layer of the network exchange RRC messages with each other.
  • RRC connection RRC Connected
  • the terminal is in an RRC connected state (Connected Mode), otherwise, it is in an RRC idle state (Idle Mode).
  • the NAS (Non-Access Stratum) layer above the RRC layer performs functions such as session management and mobility management.
  • the downlink transmission channel for transmitting data from the network to the terminal includes a broadcast channel (BCH) that transmits system information, a paging channel (PCH) that transmits paging messages, and a downlink shared channel (SCH) that transmits user traffic or control messages.
  • BCH broadcast channel
  • PCH paging channel
  • SCH downlink shared channel
  • Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH, or may be transmitted through a separate downlink multicast channel (MCH).
  • MCH downlink multicast channel
  • RACH random access channel
  • SCH uplink shared channel
  • BCCH Broadcast Control Channel
  • PCCH Paging Control Channel
  • CCCH Common Control Channel
  • MCCH Multicast Control Channel
  • MTCH Multicast. Traffic Channel
  • FIG. 4 is a diagram illustrating physical channels used in a 3GPP system and a general signal transmission method using them.
  • the terminal When the terminal is powered on or newly enters a cell, the terminal performs an initial cell search operation such as synchronizing with the base station (S401). To this end, the UE receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) from the base station to synchronize with the base station and obtain information such as cell ID. Thereafter, the terminal may receive a physical broadcast channel (PBCH) from the base station to obtain intra-cell broadcast information. Meanwhile, the UE may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • PBCH physical broadcast channel
  • DL RS downlink reference signal
  • the UE After completing the initial cell search, the UE acquires more detailed system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the information carried on the PDCCH. It can be done (S402).
  • a physical downlink control channel (PDCCH)
  • a physical downlink shared channel (PDSCH)
  • the terminal may perform a random access procedure (RACH) with respect to the base station (S403 to S406).
  • RACH random access procedure
  • the UE transmits a specific sequence as a preamble through a physical random access channel (PRACH) (S403 and S405), and a response message to the preamble through the PDCCH and the corresponding PDSCH (RAR (Random Access Response) message)
  • PRACH physical random access channel
  • RAR Random Access Response
  • a contention resolution procedure may be additionally performed (S406).
  • the UE receives PDCCH/PDSCH (S407) and physical uplink shared channel (PUSCH)/physical uplink control channel as a general uplink/downlink signal transmission procedure.
  • Control Channel; PUCCH) transmission (S408) may be performed.
  • the terminal may receive downlink control information (DCI) through the PDCCH.
  • DCI includes control information such as resource allocation information for the terminal, and different formats may be applied according to the purpose of use.
  • control information transmitted by the terminal to the base station through uplink or received by the base station by the terminal is a downlink/uplink ACK/NACK signal, a channel quality indicator (CQI), a precoding matrix index (PMI), a rank indicator (RI) ) And the like.
  • the UE may transmit control information such as the above-described CQI/PMI/RI through PUSCH and/or PUCCH.
  • the NR system is considering a method of using a high ultra-high frequency band, that is, a millimeter frequency band of 6 GHz or higher in order to transmit data while maintaining a high transmission rate to a large number of users using a wide frequency band.
  • a high ultra-high frequency band that is, a millimeter frequency band of 6 GHz or higher
  • this is used under the name NR, and in the present invention, it will be referred to as an NR system in the future.
  • NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 kHz is supported to overcome phase noise.
  • numerology or subcarrier spacing (SCS)
  • the NR frequency band is defined as a frequency range of two types (FR1, FR2).
  • FR1 is a sub 6GHz range
  • FR2 may mean a millimeter wave (mmW) in the above 6GHz range.
  • mmW millimeter wave
  • Table 1 below shows the definition of the NR frequency band.
  • the transmission power control method is a requirement (e.g., Signal-to-Noise Ratio (SNR), Bit Error Ratio (BER)), Block Error Ratio (BLER) from a base station (e.g., gNB, eNB, etc.) Etc.).
  • SNR Signal-to-Noise Ratio
  • BER Bit Error Ratio
  • BLER Block Error Ratio
  • Power control as described above may be performed by an open-loop power control method and a closed-loop power control method.
  • the open-loop power control method is a method of controlling transmission power without feedback from a transmitting device (eg, a base station) to a receiving device (eg, a terminal) and/or feedback from the receiving device to the transmitting device.
  • a transmitting device eg, a base station
  • a receiving device eg, a terminal
  • the terminal may receive a specific channel/signal from the base station and estimate the strength of the received power by using this. Thereafter, the terminal may control the transmission power by using the estimated strength of the received power.
  • the closed loop power control method refers to a method of controlling transmission power based on feedback from a transmitting device to a receiving device and/or feedback from a receiving device to a transmitting device.
  • the base station receives a specific channel/signal from the terminal, and the optimal power level of the terminal based on the power level, SNR, BER, BLER, etc. measured by the received specific channel/signal. To decide.
  • the base station transmits information (ie, feedback) on the determined optimal power level to the terminal through a control channel or the like, and the terminal can control the transmission power by using the feedback provided by the base station.
  • uplink data channel e.g., PUSCH (Physical Uplink Shared Channel)
  • uplink control channel e.g., PUCCH (Physical Uplink Control Channel)
  • SRS Sounding Reference Signal
  • PRACH Physical Random Access Channel
  • transmission occasion for PUSCH, PUCCH, SRS and/or PRACH (ie, transmission Time unit) (i) is the slot index (n_s) in the frame of the system frame number (SFN), the first symbol in the slot (S), the number of consecutive symbols (L), etc.
  • n_s the slot index in the frame of the system frame number (SFN), the first symbol in the slot (S), the number of consecutive symbols (L), etc.
  • the power control method is described below based on the case where the UE performs PUSCH transmission, but the power control method is not limited to PUCSH transmission. It goes without saying that it can be extended and applied to other uplink data channels supported by the wireless communication system.
  • the terminal In the case of PUSCH transmission in the active uplink bandwidth part (UL bandwidth part, UL BWP) of the carrier (f) of the serving cell (c), the terminal is determined by Equation 1 below. A linear power value of the determined transmission power may be calculated. Thereafter, the corresponding terminal may control the transmission power in consideration of the calculated linear power value in consideration of the number of antenna ports and/or the number of SRS ports.
  • the UE uses a parameter set configuration based on index j and a PUSCH power control adjustment state based on index l, when the carrier (f) of the serving cell (c) is activated.
  • the UE transmits PUSCH transmission power at the PUSCH transmission opportunity (i) based on Equation 1 below. (dBm) can be determined.
  • index j is an open-loop power control parameter (e.g., P_o, alpha, ), etc.), and a maximum of 32 parameter sets can be set per cell.
  • Index q_d is the path loss (PL) measurement (e.g. Indicates the index of the DL RS resource for ), and up to 4 measurements per cell can be set.
  • Index l represents an index for a closed loop power control process, and up to two processes may be set per cell.
  • P_o e.g. Is a parameter broadcast as part of system information, and may indicate target reception power at the receiving side.
  • the corresponding P_o value may be set in consideration of UE throughput, cell capacity, noise and/or interference.
  • alpha e.g.
  • Alpha may be set to a value from 0 to 1, and full pathloss compensation or fractional pathloss compensation may be performed according to the set value.
  • the alpha value may be set in consideration of interference and/or data rate between terminals.
  • the set UE transmission power may be interpreted as'configured maximum UE output power' defined in 3GPP TS 38.101-1 and/or TS38.101-2.
  • Is the subcarrier spacing ( ) May indicate a bandwidth of PUSCH resource allocation expressed as the number of resource blocks (RBs) for a PUSCH transmission opportunity.
  • related to the PUSCH power control adjustment state May be set or indicated based on the TPC command field of DCI (eg, DCI format 0_0, DCI format 0_1, DCI format 2_2, DCI format2_3, etc.).
  • a specific Radio Resource Control (RRC) parameter (e.g., SRI-PUSCHPowerControl-Mapping, etc.) is a linkage relationship between the SRI (SRS Resource Indicator) field of downlink control information (DCI) and the aforementioned indices j, q_d, and l. ) Can be represented.
  • the above-described indexes j, l, q_d, etc. may be associated with a beam, a panel, and/or a spatial domain transmission filter, based on specific information.
  • PUSCH transmission power control in units of a beam, a panel, and/or a spatial domain transmission filter may be performed.
  • parameters and/or information for PUSCH power control may be set individually (ie, independently) for each BWP.
  • the corresponding parameters and/or information may be set or indicated through higher layer signaling (eg, RRC signaling, Medium Access Control-Control Element (MAC-CE), etc.) and/or DCI.
  • RRC signaling e.g, RRC signaling, Medium Access Control-Control Element (MAC-CE), etc.
  • MAC-CE Medium Access Control-Control Element
  • parameters and/or information for PUSCH power control may be delivered through RRC signaling PUSCH-ConfigCommon, PUSCH-PowerControl, or the like.
  • the power control method is described below based on the case where the UE performs PUCCH transmission, but the power control method is not limited to PUCCH transmission. It goes without saying that it can be extended and applied to other uplink data channels supported by the wireless communication system.
  • the UE uses the PUCCH power control adjustment state based on index l, the activated UL of the carrier (f) of the primary cell (or secondary cell) (c)
  • the UE transmits PUCCH transmission power at the PUCCH transmission opportunity (i) based on Equation 2 below. (dBm) can be determined.
  • q_u represents an index for an open-loop power control parameter (eg, P_o, etc.), and up to eight parameter values may be set per cell.
  • Index q_d is the path loss (PL) measure (e.g. Indicates the index of the DL RS resource for ), and up to 4 measurements per cell can be set.
  • Index l represents an index for a closed loop power control process, and up to two processes may be set per cell.
  • P_o Is a parameter broadcast as part of system information, and may indicate target reception power at the receiving side.
  • the Po value may be set in consideration of UE throughput, cell capacity, noise and/or interference.
  • the set UE transmission power may be interpreted as'configured maximum UE output power' defined in 3GPP TS 38.101-1 and/or TS38.101-2.
  • Is the subcarrier spacing ( ) May indicate the bandwidth of PUCCH resource allocation expressed as the number of resource blocks (RBs) for the PUCCH transmission opportunity.
  • a delta function e.g.
  • PUCCH format eg, PUCCH formats 0, 1, 2, 3, 4, etc.
  • related to the PUCCH power control adjustment state May be set or indicated based on the TPC command field of DCI (eg, DCI format 1_0, DCI format 1_1, DCI format 2_2, etc.) received or detected by the terminal.
  • a specific RRC parameter eg, PUCCH-SpatialRelationInfo, etc.
  • a specific MAC-CE command eg, PUCCH spatial relation Activation/Deactivation, etc.
  • PUCCH resource and the aforementioned indexes q_u, q_d It can be used to activate or deactivate the connection relationship between, and l.
  • the PUCCH spatial relation Activation/Deactivation command in MAC-CE may activate or deactivate a connection relationship between a PUCCH resource and the aforementioned indices q_u, q_d, and l based on the RRC parameter PUCCH-SpatialRelationInfo.
  • the above-described indexes q_u, q_d, l, etc. may be associated with a beam, a panel, and/or a spatial domain transmission filter based on specific information.
  • PUCCH transmission power control in units of a beam, a panel, and/or a spatial domain transmission filter may be performed.
  • parameters and/or information for PUCCH power control may be set individually (ie, independently) for each BWP.
  • the corresponding parameters and/or information may be set or indicated through higher layer signaling (eg, RRC signaling, MAC-CE, etc.) and/or DCI.
  • parameters and/or information for PUCCH power control may be delivered through RRC signaling PUCCH-ConfigCommon, PUCCH-PowerControl, and the like.
  • the terminal When the terminal performs PRACH transmission in the activated UL BWP (b) of the carrier (f) of the serving cell (c), the terminal is based on Equation 3 below PRACH transmission power at the PRACH transmission opportunity (i) (dBm) can be determined.
  • Equation 4 May represent the set terminal transmission power.
  • the set UE transmission power may be interpreted as'configured maximum UE output power' defined in 3GPP TS 38.101-1 and/or TS38.101-2.
  • PRACH target reception power provided through higher layer signaling (eg, RRC signaling, MAC-CE, etc.) for the activated UL BWP.
  • path loss for the activated UL BWP and may be determined based on the DL RS associated with PRACH transmission in the activated DL BWP of the serving cell c.
  • the UE may determine a path loss related to PRACH transmission based on a synchronization signal (SS)/Physical Broadcast Channel (PBCH) block related to PRACH transmission.
  • SS synchronization signal
  • PBCH Physical Broadcast Channel
  • parameters and/or information for PRACH power control may be set individually (ie, independently) for each BWP.
  • the corresponding parameters and/or information may be set or indicated through higher layer signaling (eg, RRC signaling, MAC-CE, etc.).
  • parameters and/or information for PRACH power control may be delivered through RRC signaling RACH-ConfigGeneric or the like.
  • 5 is a diagram for explaining an embodiment of a procedure for controlling uplink transmission power.
  • a user equipment may receive a parameter and/or information related to Tx power from a base station (505).
  • the UE may receive corresponding parameters and/or information through higher layer signaling (eg, RRC signaling, MAC-CE, etc.).
  • higher layer signaling eg, RRC signaling, MAC-CE, etc.
  • the terminal may receive the above-described parameters and/or information related to transmission power control.
  • the terminal may receive a TPC command related to transmission power from the base station (510).
  • the UE may receive the corresponding TPC command through lower layer signaling (eg, DCI).
  • DCI lower layer signaling
  • the terminal provides information on the TPC command to be used for determining the power control adjustment state, etc., as described above, through a TPC command field of a predefined DCI format. You can receive it.
  • this step may be omitted.
  • the terminal may determine (or calculate) transmission power for uplink transmission based on parameters, information, and/or TPC commands received from the base station (515).
  • the UE may determine PUSCH transmission power, PUCCH transmission power, SRS transmission power, and/or PRACH transmission power based on the above-described scheme (eg, Equation 1, Equation 2, Equation 3, etc.).
  • the terminal performs uplink transmission in consideration of the above-described priority order. It is also possible to determine the transmit power for.
  • the UE can transmit one or more uplink channels and/or signals (eg, PUSCH, PUCCH, SRS, PRACH, etc.) to the base station based on the determined (or calculated) transmission power. There is (520).
  • uplink channels and/or signals eg, PUSCH, PUCCH, SRS, PRACH, etc.
  • the terminal may perform cell search, system information acquisition, beam alignment for initial access, and DL measurement based on the SSB.
  • SSB is used interchangeably with a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block.
  • SS/PBCH Synchronization Signal/Physical Broadcast Channel
  • the SSB is composed of PSS, SSS and PBCH.
  • the SSB is composed of 4 consecutive OFDM symbols, and PSS, PBCH, SSS/PBCH and PBCH are transmitted for each OFDM symbol.
  • the PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and the PBCH is composed of 3 OFDM symbols and 576 subcarriers.
  • Polar coding and Quadrature Phase Shift Keying (QPSK) are applied to the PBCH.
  • the PBCH consists of a data RE and a demodulation reference signal (DMRS) RE for each OFDM symbol. There are 3 DMRS REs for each RB, and 3 data REs exist between the DMRS REs.
  • DMRS demodulation reference signal
  • Cell search refers to a process in which a UE acquires time/frequency synchronization of a cell and detects a cell identifier (eg, Physical layer Cell ID, PCID) of the cell.
  • PSS is used to detect a cell ID within a cell ID group
  • SSS is used to detect a cell ID group.
  • PBCH is used for SSB (time) index detection and half-frame detection.
  • the cell search process of the terminal may be summarized as shown in Table 2 below.
  • Type of Signals Operations 1 st step PSS * SS/PBCH block (SSB) symbol timing acquisition* Cell ID detection within a cell ID group(3 hypothesis) 2 nd Step SSS * Cell ID group detection (336 hypothesis) 3 rd Step PBCH DMRS * SSB index and Half frame (HF) index(Slot and frame boundary detection) 4 th Step PBCH * Time information (80 ms, System Frame Number (SFN), SSB index, HF) * Remaining Minimum System Information (RMSI) Control resource set (CORESET)/Search space configuration 5 th Step PDCCH and PDSCH * Cell access information* RACH configuration
  • SSB SS/PBCH block
  • the SSB is transmitted periodically according to the SSB period.
  • the SSB basic period assumed by the terminal during initial cell search is defined as 20 ms.
  • the SSB period may be set to one of ⁇ 5ms, 10ms, 20ms, 40ms, 80ms, 160ms ⁇ by a network (eg, a base station).
  • a network eg, a base station.
  • a set of SSB bursts is constructed.
  • the SSB burst set consists of a 5 ms time window (ie, half-frame), and the SSB can be transmitted up to L times within the SS burst set.
  • the maximum number of transmissions L of the SSB may be given as follows according to the frequency band of the carrier. One slot contains a maximum of two SSBs.
  • the temporal position of the SSB candidate in the SS burst set may be defined as follows according to the SCS.
  • the temporal position of the SSB candidate is indexed from 0 to L-1 in the temporal order within the SSB burst set (ie, half-frame) (SSB index).
  • -Case A-15 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 2, 8 ⁇ + 14*n.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • -Case B-30 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 4, 8, 16, 20 ⁇ + 28*n.
  • n 0.
  • n 0, 1.
  • -Case C-30 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 2, 8 ⁇ + 14*n.
  • n 0, 1.
  • n 0, 1, 2, 3.
  • n 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18.
  • -Case E-240 kHz SCS The index of the start symbol of the candidate SSB is given as ⁇ 8, 12, 16, 20, 32, 36, 40, 44 ⁇ + 56*n.
  • n 0, 1, 2, 3, 5, 6, 7, 8.
  • the UE can acquire DL synchronization by detecting the SSB.
  • the terminal may identify the structure of the SSB burst set based on the detected SSB index, and accordingly, may detect a symbol/slot/half-frame boundary.
  • the number of the frame/half-frame to which the detected SSB belongs can be identified using SFN information and half-frame indication information.
  • the UE may obtain 10-bit SFN (System Frame Number) information from the PBCH (s0 to s9).
  • PBCH System Frame Number
  • MIB Master Information Block
  • PBCH TB Transport Block
  • the terminal may acquire 1-bit half-frame indication information (c0).
  • the half-frame indication information may be implicitly signaled using PBCH DMRS.
  • the UE may obtain an SSB index based on the DMRS sequence and PBCH payload.
  • SSB candidates are indexed from 0 to L-1 in time order within the SSB burst set (ie, half-frame).
  • L 4 out of 3 bits that can be indicated using 8 PBCH DMRS sequences, the SSB index is indicated and the remaining 1 bit may be used for half-frame indication (b2).
  • the UE may acquire AS-/NAS-information through the SI acquisition process.
  • the SI acquisition process may be applied to a UE in an RRC_IDLE state, an RRC_INACTIVE state, and an RRC_CONNECTED state.
  • SI is divided into MIB (Master Information Block) and a plurality of SIB (System Information Block).
  • the MIB and the plurality of SIBs may be further divided into a minimum SI (SI) and another SI (other SI).
  • SI minimum SI
  • SIB 1 may be referred to as RMSI (Remaining Minimum System Information).
  • RMSI Remaining Minimum System Information
  • the MIB includes information/parameters related to SIB1 (SystemInformationBlockType1) reception and is transmitted through the PBCH of the SSB.
  • SIB1 SystemInformationBlockType1
  • the UE Upon initial cell selection, the UE assumes that the half-frame with SSB is repeated in a 20ms cycle. The UE may check whether there is a CORESET (Control Resource Set) for the Type0-PDCCH common search space based on the MIB.
  • the Type0-PDCCH common search space is a kind of PDCCH search space, and is used to transmit a PDCCH for scheduling SI messages.
  • the UE based on the information in the MIB (e.g., pdcch-ConfigSIB1) (i) a plurality of consecutive RBs constituting CORESET and one or more consecutive symbols and (ii) PDCCH opportunity (Ie, a time domain location for PDCCH reception) can be determined.
  • pdcch-ConfigSIB1 provides information on a frequency location in which SSB/SIB1 exists and a frequency range in which SSB/SIB1 does not exist.
  • SIBx includes information related to availability and scheduling (eg, transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, x is an integer greater than or equal to 2).
  • SIB1 may inform whether SIBx is periodically broadcast or is provided at a request of a terminal through an on-demand method.
  • SIB1 may include information necessary for the UE to perform an SI request.
  • SIB1 is transmitted through a PDSCH
  • PDCCH scheduling SIB1 is transmitted through a Type0-PDCCH common search space
  • SIB1 is transmitted through a PDSCH indicated by the PDCCH.
  • -SIBx is included in the SI message and transmitted through the PDSCH.
  • Each SI message is transmitted within a periodic time window (ie, SI-window).
  • Beam sweeping means that a transmission reception point (TRP) (eg, a base station/cell) changes a beam (direction) of a radio signal according to time (hereinafter, a beam and a beam direction may be mixed).
  • TRP transmission reception point
  • SSB may be periodically transmitted using beam sweeping.
  • the SSB index is implicitly linked with the SSB beam.
  • the SSB beam may be changed in units of SSB (index) or may be changed in units of SSB (index) groups. In the latter case, the SSB beam remains the same within the SSB (index) group. That is, the transmission beam echo of the SSB is repeated in a plurality of consecutive SSBs.
  • the maximum number of transmissions L of the SSB in the SSB burst set has a value of 4, 8 or 64 depending on the frequency band to which the carrier belongs. Accordingly, the maximum number of SSB beams in the SSB burst set may also be given as follows according to the frequency band of the carrier.
  • the number of SSB beams is 1.
  • the terminal may align the base station and the beam based on the SSB. For example, after performing SSB detection, the terminal identifies the best SSB. Thereafter, the terminal may transmit the RACH preamble to the base station by using the PRACH resource linked/corresponding to the index (ie, the beam) of the best SSB.
  • the SSB can be used to align the beam between the base station and the terminal even after initial access.
  • FIG. 11 illustrates a method of informing an actually transmitted SSB (SSB_tx).
  • a maximum of L SSBs may be transmitted, and the number/locations at which SSBs are actually transmitted may vary for each base station/cell.
  • the number/locations at which SSBs are actually transmitted is used for rate-matching and measurement, and information on the actually transmitted SSBs is indicated as follows.
  • rate-matching It may be indicated through UE-specific RRC signaling or RMSI.
  • the UE-specific RRC signaling includes a full (eg, length L) bitmap in both the below 6GHz and above 6GHz frequency ranges.
  • RMSI includes a full bitmap at below 6GHz, and includes a compressed bitmap at above 6GHz.
  • information on the actually transmitted SSB may be indicated using a group-bit map (8 bits) + an intra-group bit map (8 bits).
  • a resource (eg, RE) indicated through UE-specific RRC signaling or RMSI is reserved for SSB transmission, and PDSCH/PUSCH may be rate-matched in consideration of SSB resources.
  • the network When in the RRC connected mode, the network (eg, the base station) may indicate the SSB set to be measured within the measurement interval.
  • the SSB set may be indicated for each frequency layer. If there is no indication regarding the SSB set, the default SSB set is used.
  • the default SSB set includes all SSBs in the measurement interval.
  • the SSB set may be indicated using a full (eg, length L) bitmap of RRC signaling.
  • the default SSB set is used.
  • FIG. 12 is a diagram illustrating an example of a wireless communication system supporting an unlicensed band to which various embodiments of the present disclosure are applicable.
  • a cell operating in a licensed band is defined as an L-cell, and a carrier of the L-cell is defined as a (DL/UL) LCC.
  • a cell operating in an unlicensed band (hereinafter, U-band) is defined as a U-cell, and a carrier of the U-cell is defined as (DL/UL) UCC.
  • the carrier/carrier-frequency of the cell may mean the operating frequency (eg, center frequency) of the cell.
  • Cell/carrier eg, CC
  • a cell is collectively referred to as a cell.
  • the terminal and the base station may transmit and receive signals through one UCC or a plurality of LCCs and UCCs combined with a carrier. That is, the terminal and the base station can transmit and receive signals through only UCC(s) without an LCC.
  • the signal transmission/reception operation in the unlicensed band described in various embodiments of the present disclosure may be performed based on all of the above-described deployment scenarios (unless otherwise noted).
  • a frame structure type 3 or NR frame structure of LTE may be used for operation in an unlicensed band.
  • the configuration of OFDM symbols occupied for uplink/downlink signal transmission in the frame structure for the unlicensed band may be set by the base station.
  • the OFDM symbol may be replaced with an SC-FDM(A) symbol.
  • the base station may inform the terminal of the configuration of OFDM symbols used in subframe #n through signaling.
  • a subframe may be replaced with a slot or a time unit (TU).
  • the UE subframes through a specific field (e.g., Subframe configuration for LAA field, etc.) received from the base station in subframe #n-1 or subframe #n. It is possible to assume (or identify) the configuration of the OFDM symbol occupied in #n.
  • a specific field e.g., Subframe configuration for LAA field, etc.
  • Table 3 shows the configuration of OFDM symbols used for transmission of a downlink physical channel and/or a physical signal in a current and/or next subframe in a subframe configuration for LAA field in a wireless communication system. Illustrate how to represent.
  • the base station may inform the terminal of information on the uplink transmission period through signaling.
  • the terminal may obtain'UL duration' and'UL offset' information for subframe #n through the'UL duration and offset' field in the detected DCI.
  • Table 4 illustrates how the UL duration and offset field indicates UL offset and UL duration configuration in a wireless communication system.
  • -A channel may mean a carrier or a part of a carrier composed of a contiguous set of RBs on which a channel access procedure is performed in a shared spectrum.
  • the channel access procedure may be a sensing-based procedure for evaluating the availability of a channel for performing transmission.
  • -Channel occupancy may mean transmission in a channel by a base station/UE after performing a corresponding channel access procedure in this section.
  • -Channel occupancy time means that after the base station/UE performs the corresponding channel access procedure in this section, the base station/UE and any base station/UE(s) sharing channel occupancy transmit transmission on the channel. It can mean the total time performed. In order to determine the channel occupancy time, if the transmission gap is 25 us or less, the gap duration may be counted as the channel occupancy time. The channel occupancy time may be shared for transmission between the base station and the corresponding UE(s).
  • the base station may perform the following downlink channel access procedure (CAP) for the unlicensed band in order to transmit a downlink signal in the unlicensed band.
  • CAP downlink channel access procedure
  • This section describes a channel access procedure performed by a base station in which a time duration spanned by a sensing slot sensed idle before downlink transmission(s) is random. This clause is applicable to the following transmissions:
  • the transmission period may be greater than 1 ms, or the transmission may cause the discovery burst duty cycle to exceed 1/20.
  • the base station senses whether the channel is in an idle state during the sensing slot period of the delay period T d , and after the counter N is 0 in step 4 below, the base station may transmit transmission. At this time, the counter N is adjusted by channel sensing for an additional sensing slot duration according to the following procedure:
  • N init is an arbitrary number of evenly distributed between p is from 0 CW (random number uniformly distributed between 0 and CW p). Then go to step 4.
  • step 3 The channel for the additional sensing slot period is sensed. At this time, if the additional sensing slot period is idle, the process moves to step 4. If not, go to step 5.
  • step 6 If the corresponding channel is sensed as idle during all sensing slot periods of the additional delay period T d, the process moves to step 4. If not, go to step 5.
  • FIG. 13 is a diagram illustrating a DL CAP for unlicensed band transmission to which various embodiments of the present disclosure are applicable.
  • a type 1 downlink channel access procedure for unlicensed band transmission to which various embodiments of the present disclosure are applicable may be summarized as follows.
  • a transmitting node eg, a base station
  • CAP channel access procedure
  • the base station may randomly select the backoff counter N within the contention window (CW) according to step 1.
  • the value of N is set to the initial value Ninit (2020).
  • Ninit is selected as an arbitrary value from 0 to CWp.
  • step 4 if the backoff counter value (N) is 0 (2030; Y), the base station ends the CAP process (2032). Subsequently, the base station may perform Tx burst transmission (2034). On the other hand, if the backoff counter value is not 0 (2030; N), the base station decreases the backoff counter value by 1 according to step 2 (2040).
  • the base station checks whether the channel is in an idle state (2050), and if the channel is in an idle state (2050; Y), it checks whether the backoff counter value is 0 (2030).
  • the base station uses a delay period longer than the sensing slot time (eg, 9usec) according to step 5 (defer duration Td; 25usec). For above), it is checked whether the corresponding channel is in an idle state (2060). If the channel is idle in the delay period (2070; Y), the base station may resume the CAP process again.
  • a delay period longer than the sensing slot time eg, 9usec
  • the base station senses the channel during the delay period to determine whether it is in the idle state. At this time, if the channel is idle during the delay period, the base station does not set the backoff counter value Ninit, but can perform the CAP process again from the backoff counter value 5 (or from 4 after decreasing the backoff counter value by 1). have.
  • the base station performs step 2060 again to check whether the channel is in the idle state during the new delay period.
  • the base station may transmit transmission on the channel if the following conditions are satisfied:
  • the base station When the base station is prepared to transmit transmission and the corresponding channel is sensed as idle during at least the sensing slot period Tsl, and immediately before the transmission, the channel is sensed as idle during all sensing slot periods of the delay period Td. Occation
  • the base station senses the channel after being prepared to transmit transmission, the channel is not sensed as idle during the sensing slot period Tsl, or immediately before the intended transmission (immediately before) any one of the delay period Td. If the channel is not sensed as idle during the sensing slot period, the base station proceeds to step 1 after sensing that the channel is idle during the sensing slot period of the delay period Td (proceed to step 1).
  • each sensing slot period Tsl is 9us
  • Tf includes an idle sensing slot period Tsl at the start point of Tf.
  • Table 5 illustrates that mp applied to the CAP, minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes vary according to the channel access priority class.
  • Tf includes a sensing slot at the start point of Tf.
  • Tf includes a sensing slot occurring within the last 9 us of Tf.
  • the base station does not sense the channel before transmitting the transmission.
  • the maximum duration corresponding to the transmission is 584us.
  • the base station may access multiple channels on which transmission is performed through one of the following type A or type B procedures.
  • the base station Phase channel connection is performed.
  • C is a set of channels intended to be transmitted by the base station
  • q is the number of channels to be transmitted by the base station.
  • Counter N considered in CAP is for each channel It is determined for each channel, and in this case, the counter for each channel is Mark d.
  • Counter N considered in CAP is for each channel It is determined for each channel, and the counter for each channel is Mark d.
  • any one channel of the base station In the case of cease transmission, if the absence of any other technology sharing the channel can be guaranteed for a long period (e.g., by the level of regulation) (if the absence of any other technology sharing the channel can be guaranteed on a long term basis (eg, by level of regulation)), each channel c i (where c i is different from c j, )for, After waiting for a section of or When an idle sensing slot is detected after reinitializing, the base station Decrease can be resumed.
  • Each channel Star counter N may be determined according to the above-described contents, in which case the counter for each channel is Mark d. here, May mean a channel having the largest CW p value.
  • Base station When ceases transmission for any one channel for which is determined, the base station is used for all channels. Reinitialize.
  • the base station is a multi-channel Prior to transmission of each phase, uniformly randomly from C above Or
  • the base station is more than once every 1 second Do not choose.
  • C is a set of channels intended to be transmitted by the base station
  • q is the number of channels to be transmitted by the base station.
  • the base station 4.2.1. Section or 4.2.2. Channels in accordance with the procedures set out in Section 3.1 together with the indications set out in Section 3.1. Channel access on the server.
  • the base station is a channel Immediately before transmission on the image (sensing interval) at least While channel Is sensed. And, the base station is at least a sensing period While channel Immediately after sensing that the child is a child (immediately after) channel Transfer can be performed on the. Given interval My channel When the channel is sensed as idle during all time periods in which phase idle sensing is performed, the channel Is Can be considered as children for.
  • the base station is a channel (At this time, ), (for a period exceeding T mcot,p) transmission is not performed for a period exceeding T mcot,p in Table 5 above.
  • T mcot,p is the channel It is determined using the channel access parameters used for.
  • the channel frequency of the channel set C selected by the gNB is one subset of the predefined channel frequency sets.
  • a single CW p value is maintained for channel set C.
  • Step 2 of the procedure described above in Section 3.1 is modified as follows.
  • CW p value for each channel Is maintained independently for the sake of channel To determine the CW p for the channel Any PDSCH that completely or partially overlaps with may be used.
  • channel To determine the N init for the channel The CW p value of is used. here, Is the channel with the largest CW p among all channels in set C.
  • the UE and the base station scheduling or configuring UL transmission for the UE perform the following procedure for access to a channel (performing LAA S cell transmission(s)).
  • a P cell which is a licensed band
  • an S cell which is one or more unlicensed bands
  • an uplink CAP operation applicable to various embodiments of the present disclosure will be described in detail do.
  • the uplink CAP operation may be equally applied even when only an unlicensed band is set for the terminal and the base station.
  • the UE may access a channel on which UL transmission(s) is performed according to a type 1 or type 2 UL channel access procedure.
  • Table 6 illustrates that mp applied to the CAP, minimum CW, maximum CW, maximum channel occupancy time (MCOT), and allowed CW sizes vary according to the channel access priority class.
  • This section describes a channel access procedure performed by a UE in which a time duration spanned by a sensing slot sensed idle before uplink transmission(s) is random. This clause is applicable to the following transmissions:
  • FIG. 14 is a diagram illustrating a UL CAP for unlicensed band transmission to which various embodiments of the present disclosure are applicable.
  • the type 1 UL CAP of the UE for unlicensed band transmission to which various embodiments of the present disclosure are applicable may be summarized as follows.
  • a transmitting node eg, UE may initiate a channel access procedure (CAP) to operate in an unlicensed band (2110).
  • CAP channel access procedure
  • the UE may randomly select the backoff counter N within the contention window (CW) according to step 1.
  • the value of N is set to the initial value Ninit (2120).
  • Ninit is selected as an arbitrary value from 0 to CWp.
  • step 4 if the backoff counter value (N) is 0 (2130; Y), the UE ends the CAP process (2132). Subsequently, the UE may perform Tx burst transmission (2134). On the other hand, if the backoff counter value is not 0 (2130; N), the UE decreases the backoff counter value by 1 according to step 2 (2140).
  • the UE checks whether the channel is in an idle state (2150), and if the channel is in an idle state (2150; Y), it checks whether the backoff counter value is 0 (2130).
  • the UE Conversely, if the channel is not in an idle state in operation 2150, that is, if the channel is busy (2150; N), the UE has a delay period longer than the slot time (e.g., 9usec) according to step 5 (defer duration Td; 25usec or more) ), it is checked whether the corresponding channel is in an idle state (2160). If the channel is idle in the delay period (2170; Y), the UE may resume the CAP process again.
  • the slot time e.g. 9usec
  • the UE senses the channel during the delay period to determine whether it is in the idle state. At this time, if the channel is idle during the delay period, the UE does not set the backoff counter value Ninit, but can perform the CAP process again from the backoff counter value 5 (or from 4 after decreasing the backoff counter value by 1). have.
  • the UE performs operation 2160 again to check whether the channel is in the idle state during the new delay period.
  • the UE when the UE does not transmit UL transmission on a channel on which transmission(s) is performed after step 4 of the above-described procedure, the UE may transmit UL transmission on the channel if the following conditions are satisfied.
  • the channel in the sensing slot period Tsl is not sensed as idle, or any sensing slot period in the delay period Td immediately before the intended transmission. If the corresponding channel is not sensed as idle during the period, the UE proceeds to step 1 after the corresponding channel is sensed as idle during the slot periods of the delay period Td.
  • each slot period Tsl is 9us
  • Tf includes an idle slot period Tsl at the start point of Tf.
  • T short_ul is one sensing slot section Immediately following (immediately followed) section It consists of.
  • T f includes a sensing slot at the start point of T f.
  • the UE uses the type 2B channel access procedure for UL transmission.
  • Tf includes a sensing slot occurring within the last 9 us of Tf.
  • the UE If the UE is instructed to perform the Type 2C UL channel access procedure, the UE does not sense the channel before transmitting the transmission in order to transmit the transmission.
  • the maximum duration corresponding to the transmission is 584us.
  • -It is an intention to perform uplink transmission on resources set on channel set C using a type 1 channel access procedure
  • channel frequencies of channel set C are a subset of one of the preset channel frequency sets:
  • the UE uses a type 2 channel access procedure Transfer can be performed on the.
  • a channel prior to performing a type 1 channel access procedure on any (any) channel in channel set C. Is uniformly randomly selected from channel set C by the UE.
  • the UE is a channel within the bandwidth of the carrier of the scheduled or carrier bandwidth set by UL resources. May not be transmitted from.
  • FIG. 15 illustrates an example of a random access process.
  • FIG. 15 illustrates a contention-based random access process.
  • the UE may transmit a random access preamble through the PRACH as Msg1 in the random access procedure in the UL.
  • Random access preamble sequences having two different lengths are supported.
  • the long sequence length 839 is applied for subcarrier spacing of 1.25 and 5 kHz, and the short sequence length 139 is applied for subcarrier spacing of 15, 30, 60 and 120 kHz.
  • the RACH configuration for the initial bandwidth of the primary cell (Pcell) is included in the system information of the cell and provided to the terminal.
  • the RACH configuration includes information on a subcarrier spacing of the PRACH, available preambles, and preamble format.
  • the RACH configuration includes association information between SSBs and RACH (time-frequency) resources. The UE transmits a random access preamble in the RACH time-frequency resource associated with the detected or selected SSB.
  • the SSB threshold for RACH resource association can be set by the network, and the RACH preamble is transmitted based on the SSB whose reference signal received power (RSRP) measured based on the SSB satisfies the threshold. Or, retransmission is performed. For example, the UE may select one of SSB(s) meeting the threshold value, and transmit or retransmit the RACH preamble based on the RACH resource associated with the selected SSB. For example, upon retransmission of the RACH preamble, the UE may reselect one of the SSB(s) and retransmit the RACH preamble based on the RACH resource associated with the reselected SSB. That is, the RACH resource for retransmission of the RACH preamble may be the same and/or different from the RACH resource for transmission of the RACH preamble.
  • RSRP reference signal received power
  • the BS When the BS (base station) receives the random access preamble from the UE, the BS transmits a random access response (RAR) message (Msg2) to the UE.
  • RAR random access response
  • the PDCCH for scheduling the PDSCH carrying the RAR is transmitted after being CRC scrambled with a random access (RA) radio network temporary identifier (RNTI) (RA-RNTI).
  • RA-RNTI radio network temporary identifier
  • the UE that detects the CRC scrambled PDCCH with RA-RNTI may receive the RAR from the PDSCH scheduled by the DCI carried by the PDCCH.
  • the UE checks whether the preamble transmitted by the UE, that is, random access response information for Msg1, is in the RAR.
  • Whether there is random access information for Msg1 transmitted by the UE may be determined based on whether there is a random access 0 preamble ID for the preamble transmitted by the UE. If there is no response to Msg1, the UE may retransmit the RACH preamble within a certain number of times while performing power ramping. The UE calculates the PRACH transmit power for retransmission of the preamble based on the most recent transmit power, power increment amount, and power ramping counter.
  • the random access response information includes a preamble sequence transmitted by the terminal, a temporary cell-RNTI (TC-RNTI) allocated by the base station to the terminal attempting random access, and uplink transmit time alignment information.
  • TC-RNTI temporary cell-RNTI
  • Uplink transmission power adjustment information and uplink radio resource allocation information may be included.
  • the UE can know timing advance information for UL synchronization, an initial UL grant, and TC-RNTI.
  • the timing advance information is used to control the uplink signal transmission timing.
  • the network (e.g., BS) provides timing advance information based on the timing information detected from the PRACH preamble received from the UE. Acquire and transmit the corresponding timing advance information to the terminal.
  • the UE may transmit UL transmission as Msg3 in a random access procedure on an uplink shared channel based on random access response information.
  • Msg3 may include an RRC connection request and a UE identifier.
  • the network may send Msg4, which may be treated as a contention resolution message on the DL. By receiving Msg4, the UE can enter the RRC connected state.
  • the contention-free random access process may be used in the process of handing over to another cell or BS by the UE, or may be performed when requested by the command of the BS.
  • the basic process of the contention-free random access process is similar to the contention-based random access process. However, unlike a contention-based random access process in which the UE randomly selects a preamble to be used among a plurality of random access preambles, in the case of a contention-free random access process, the preamble to be used by the UE (hereinafter, dedicated random access preamble) is determined by the BS. It is assigned to the UE.
  • Information on the dedicated random access preamble may be included in an RRC message (eg, a handover command) or may be provided to the UE through a PDCCH order.
  • the UE transmits a dedicated random access preamble to the BS.
  • the UE receives the random access process from the BS, the random access process is completed.
  • the UL grant in the RAR schedules PUSCH transmission to the UE.
  • the PUSCH carrying the initial UL transmission by the UL grant in the RAR is also referred to as Msg3 PUSCH.
  • the contents of the RAR UL grant start at the MSB and end at the LSB, and are given in Table 7.
  • RAR UL grant field Number of bits Frequency hopping flag One Msg3 PUSCH frequency resource allocation 12 Msg3 PUSCH time resource allocation 4 Modulation and coding scheme (MCS) 4 Transmit power control (TPC) for Msg3 PUSCH 3 CSI request One
  • the TPC command is used to determine the transmit power of the Msg3 PUSCH, and is interpreted according to Table 8, for example.
  • the CSI request field in the RAR UL grant indicates whether the UE will include aperiodic CSI report in the corresponding PUSCH transmission.
  • the subcarrier spacing for Msg3 PUSCH transmission is provided by the RRC parameter.
  • the UE will transmit PRACH and Msg3 PUSCH on the same uplink carrier of the same serving cell.
  • the UL BWP for Msg3 PUSCH transmission is indicated by System Information Block1 (SIB1).
  • FIGS. 16 to 17 Prior to the detailed description, an example of implementing operations of a terminal and a base station according to an embodiment of the present disclosure will be described with reference to FIGS. 16 to 17.
  • the UE may transmit an uplink signal including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH) (S1601). Thereafter, the UE may receive a downlink signal related to contention resolution in response to the uplink signal (S1603).
  • PRACH physical random access channel
  • PUSCH physical uplink shared channel
  • S1603 downlink signal related to contention resolution in response to the uplink signal
  • a specific method of transmitting and receiving a signal for the UE of S1601 to S1603 to perform the random access process may be based on the embodiments and features described later.
  • the terminal of FIG. 16 may be any one of various wireless devices disclosed in FIGS. 22 to 25.
  • the terminal of FIG. 16 may be the first wireless device 100 of FIG. 22 or the wireless devices 100 and 200 of FIG. 23.
  • the operation process of FIG. 16 may be performed and executed by any one of various wireless devices disclosed in FIGS. 22 to 25.
  • the base station receives an uplink signal including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH) (S1701), and then in response to the uplink signal, A downlink signal related to contention resolution may be transmitted (S1703).
  • PRACH physical random access channel
  • PUSCH physical uplink shared channel
  • S1703 A downlink signal related to contention resolution may be transmitted.
  • a specific method of transmitting and receiving a signal for performing a random access procedure by the base stations of S1701 to S1703 may be based on embodiments and features described later.
  • the base station of FIG. 17 may be any one of various wireless devices disclosed in FIGS. 22 to 25.
  • the base station of FIG. 17 may be the second wireless device 200 of FIG. 22 or the wireless devices 100 and 200 of FIG. 23.
  • the operation process of FIG. 17 may be performed and executed by any one of various wireless devices disclosed in FIGS. 22 to 25.
  • the UE may perform UL transmission through a random access procedure (RACH Procedure) without being scheduled for direct uplink (UL) transmission from a given base station or cell.
  • RACH Procedure random access procedure
  • the random access process in LTE and/or the system includes: 1) transmission of a random access preamble, 2) reception of a message (Msg) 2 corresponding to a random access response (RAR) , 3) Transmission of Msg 3 including Physical Uplink Shared Channel (PUSCH), 4) 4-step of reception of Msg 4 including information on contention resolution ) Procedure.
  • Msg 2 is a message in which the base station receiving a preamble allocates UL resources to be used when the terminal transmitting the preamble transmits Msg 3.
  • the terminal provides a connection request along with its own identification information such as an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI). Information can be transmitted.
  • IMSI International Mobile Subscriber Identity
  • TMSI Temporary Mobile Subscriber Identity
  • the base station receiving Msg 3 transmits identification information of the corresponding terminal and information necessary for random access through Msg 4, thereby preventing collisions that may occur between different terminals during the random access process, and performing a random access procedure for the corresponding terminal. You can complete it.
  • the UE transmits a message corresponding to Msg 3 together with a preamble to the base station as Msg A, and in response to Msg A, the base station sends a message corresponding to Msg 4 together with RAR as Msg B. Send it to the terminal.
  • the terminal receiving Msg B completes the random access procedure by decoding Msg B and then performs data transmission/reception.
  • the terminal may receive 2-step RACH-related configuration information included in system information broadcasted from the base station (S1801).
  • the UE Upon receiving the 2-step RACH-related configuration information, the UE transmits the RACH preamble (or PRACH preamble) and Msg A including the PUSCH based on the configuration information in order to perform a random access procedure for the base station (S1803).
  • the RACH preamble and PUSCH may be transmitted at regular intervals or successively transmitted in a time domain, and the corresponding PUSCH includes information about an identifier (ID) of the terminal.
  • ID an identifier
  • the base station is able to predict and receive a PUSCH or a continuous PUSCH having a corresponding gap by detecting a preamble.
  • the base station receives an access request and/or response from an upper layer based on the ID information of the terminal transmitted through the PUSCH, and then sends Msg B including information such as RAR and contention resolution to the terminal as a response to Msg A. It is transmitted (S1805). Thereafter, depending on whether the terminal receives Msg B, the terminal can complete access to the base station and transmit and receive data with the base station in the same or similar manner as after the operation of receiving Msg 4 in the existing 4-step RACH procedure.
  • the Listen Before Talk (LBT) process required for signal transmission and reception in the unlicensed band can be applied to signal transmission and reception for the random access procedure. That is, in the NR-Unlicensed spectrum (NR-U) system, LBT is always performed to check the idle or busy state of the transmission/reception channel before the base station and the terminal transmit and receive signals, which is a 2-step RACH procedure in the unlicensed band. The same may be performed in the procedure for transmitting and receiving Msg A and Msg B for.
  • LBT Listen Before Talk
  • the transmission of Msg A in the 2-step RACH procedure includes the transmission of the Msg A PUSCH along with the transmission of the Msg A PRACH preamble, it is performed later depending on the success or failure of the LBT for the Msg A PRACH preamble and Msg A PUSCH.
  • Random access procedure can be changed. For example, if the UE successfully performs LBT before transmission of Msg A PRACH preamble and Msg A PUSCH and transmits to Msg A PUSCH without any problem, the base station correctly receives both Msg A PRACH preamble and Msg A PUSCH to resolve contention.
  • Msg B including information can be transmitted to the terminal and the 2-step RACH procedure can be completed.
  • the UE fails to LBT for Msg A PRACH preamble or Msg A PUSCH, the UE cannot successfully transmit Msg A, and the base station that does not receive Msg A instructs retransmission for Msg A or 4-step RACH procedure You can instruct a fall-back to a low.
  • Msg A is retransmitted due to LBT failure is a time gap between the transmission times of Msg A PRACH preamble and Msg A PUSCH, considering that Msg A includes both Msg A PRACH preamble and Msg A PUSCH.
  • Msg A includes both Msg A PRACH preamble and Msg A PUSCH.
  • the retransmission procedure of Msg A may vary depending on whether it is in a situation.
  • Msg A PRACH preamble and Msg A PUSCH are continuously transmitted, Msg A PRACH preamble and Msg A PUSCH are continuously transmitted in a single slot, or Msg A PRACH preamble and Msg A PUSCH associated therewith are transmitted in a single slot. It may mean the case of being transmitted.
  • the case in which the Msg A PRACH preamble and Msg A PUSCH are continuously transmitted includes a case where there is no time interval as long as the minimum time required for the LBT between the transmission of the Msg A PRACH preamble and Msg A PUSCH, and FIG. 19 Such a situation can be an example.
  • FIG. 19 is a diagram illustrating an embodiment of transmission of Msg A according to whether a terminal succeeds or fails in an LBT and a configuration of a transmission beam direction.
  • 19(A) shows that the UE succeeds in LBT at a specific time and continuously transmits Msg A PRACH preamble and Msg A PUSCH
  • FIG. 19(B) shows that after the UE fails to LBT at a specific time, the This indicates that the LBT at the next time point is successful and the Msg A PRACH preamble and Msg A PUSCH are continuously transmitted.
  • the UE may perform LBT for Msg A PRACH preamble transmission again for the next RACH Occasion (RO) after the Association period from the time when the LBT fails.
  • RO RACH Occasion
  • the terminal if the terminal fails in LBT for Msg A PRACH preamble transmission at a certain point in time, the terminal starts a random access resource selection procedure anew, and the synchronization signal and physical broadcast channel (SSB; SS/PBCH) or SSB selection is performed based on the Reference Signal Received Power (RSRP) of CSI-RS (Channel State Information-Reference Signal), and the RO associated with SSB and RAPID (Random Access Preamble Index) are selected and the corresponding RO Msg A PRACH preamble can be transmitted, and Msg A PUSCH can also be continuously transmitted.
  • RSRP Reference Signal Received Power
  • CSI-RS Channel State Information-Reference Signal
  • the information (contents) and the modulation order included in the Msg A PUSCH according to the channel environment in which the Msg A PUSCH is transmitted. ) May be set differently from the previous Msg A PUSCH transmission. For example, when the channel state at the time of transmission of the Msg A PUSCH is good, the UE may transmit the Msg A PUSCH with a larger amount of information included, and a high demodulation order may be applied.
  • Msg A since Msg A PUSCH is transmitted after Msg A PRACH preamble is transmitted and before feedback from the base station, the maximum number of transmissions for Msg A retransmission, ramping step size, power ramping counter, etc. Transmission factors need to be set separately, and among them, specific methods to be described later may be considered for setting the power ramping counter and the maximum number of transmissions of Msg A.
  • the terminal may transmit the Msg A PRACH preamble after LBT success by re-performing the LBT in the next RO as shown in FIG. 19(B).
  • the UE maintains or increases the power value compared to the power ramping counter that was attempted to transmit the Msg A PRACH preamble when the previous LBT fails.
  • the power ramping counter referred to in the present disclosure may mean a power ramping counter used for general retransmission.
  • the terminal may first maintain the value of the power ramping counter as it is. That is, if the terminal performs LBT on the next RO due to LBT failure on the previous RO and transmits Msg A after success, it means that Msg A itself was not transmitted from the previous RO from the terminal point of view. Increasingly increasing the transmission power of the terminal may cause inefficient power waste. Eventually, the terminal may transmit Msg A by maintaining the originally intended transmission power by maintaining the value of the power ramping counter as it is.
  • the terminal may determine the transmission power by increasing the value of the power ramping counter.
  • the power ramping counter can be set by increasing the existing value by +1 to determine the transmission power. Determining the transmission power of Msg A by applying the power ramping counter increased by +1 means that other terminals that have tried the same RACH at the time of the previous RO will ramp the power at the time of the next RO to attempt RACH with the increased transmission power. In consideration of the fact that the transmission power is relatively small, it is possible to prevent the problem that the Msg A PRACH preamble of the terminal may be difficult to detect.
  • the purpose of introducing the 2-step RACH procedure is to further reduce the latency caused by the 4-step RACH procedure, so that the terminal can access the network faster as the latency due to LBT in NR-U is delayed.
  • the terminal may use a method of maintaining or increasing the power ramping counter according to the transmission beam direction.
  • the terminal determines the LBT failure for the previous RO as retransmission, but the terminal This is a method of increasing or maintaining the power ramping counter according to the transmission beam of.
  • FIG. 20 is a diagram illustrating an embodiment of the present disclosure in which a power ramping counter is maintained or increased according to a transmission beam direction of a terminal.
  • the UE Msg A can be transmitted by maintaining the power ramping counter of the same value as before.
  • the terminal increases the power ramping counter than before So that Msg A can be transmitted.
  • the UE determines whether the transmission or retransmission of the last Msg A and the transmission spatial beam direction are the same. Accordingly, the transmit power is set by maintaining or increasing the power ramping counter. At this time, since the transmission spatial beam direction for transmission or retransmission of Msg A will be associated with the SSB selected by the terminal for transmission or retransmission of Msg A, the terminal may have the SSB selected for transmission or retransmission of Msg A past Msg.
  • the transmission spatial beam direction for transmission or retransmission of the last Msg A includes a transmission spatial beam direction configured for transmission or retransmission of the last PRACH. It can be understood as a concept of doing.
  • Msg A when the UE transmits or retransmits Msg A, if the UE does not receive an indication from the lower layer that the LBT for the transmission or retransmission of the Msg A has failed, the UE transmits or retransmits the PRACH past its SSB. If it is not changed compared to the selected SSB, Msg A can be transmitted by setting the transmission power by increasing the power ramping counter by 1 compared to the previous one.
  • Msg A when the UE transmits or retransmits Msg A, if the UE does not receive an indication from the lower layer that the LBT for the transmission or retransmission of the Msg A has failed, the UE transmits or retransmits the PRACH that the SSB selected by itself has passed. If it is changed compared to the SSB selected for, Msg A can be transmitted by setting the transmission power by maintaining the power ramping counter at the same value as before.
  • the terminal determines the LBT failure as retransmission and performs retransmission. If an indication for LBT failure recovery is configured, the UE may perform a random access resource selection procedure for a 2-step RACH procedure.
  • the UE may increase or maintain the power ramping counter according to the relationship between the RO of the 2-step RACH procedure and the 4-step RACH procedure. That is, the ramping counter may be increased or maintained depending on whether the RO for the 2-step RACH procedure and the RO for the 4-step RACH procedure are shared with each other or are set separately from each other.
  • the RO of the 2-step RACH procedure and the 4-step RACH procedure can be basically shared, and that the RO is shared means that the Msg 1 preamble in the 4-step RACH procedure and the Msg A PRACH preamble in the 2-step RACH procedure are It means that it is transmitted from the same RO.
  • the RO is set separately from each other means that the time/frequency resource for the Msg 1 preamble in the 4-step RACH procedure and the time/frequency resource for the Msg A PRACH preamble in the 2-step RACH procedure are It means to exist independently of each other.
  • the method is used to determine whether the RO is shared or set separately from each other.
  • Another power ramping counter determination method is applied. That is, when the RO for the 2-step RACH procedure and the RO for the 4-step RACH procedure are set separately from each other, the terminal performing the 2-step RACH procedure is The LBT failure at is recognized as a transmission/reception failure, and the value of the power ramping counter is increased for retransmission.
  • the UE can perform the 4-step RACH of the existing NR-U without distinction between the 2-step RACH procedure or the 4-step RACH procedure.
  • the value of the power ramping counter is maintained as in the previous 1) method.
  • the maximum number of transmissions of Msg A in the 2-step RACH procedure can be given separately from the 4-step RACH procedure, and if there is no value given separately, the maximum number of transmissions set for Msg 1 of the 4-step RACH procedure should be followed. can do. If the value of the power ramping counter is set to be greater than the maximum number of transmissions of Msg A by 1, the terminal may proceed with the reestablishment procedure according to Radio Link Failure (RLF). In addition, when the RO for the 2-step RACH procedure and the RO for the 4-step RACH procedure are shared with each other, the maximum number of transmissions of Msg 1 for the 4-step RACH procedure is the maximum number of Msg A in the 2-step RACH procedure.
  • RLF Radio Link Failure
  • the terminal may transmit only Msg 1 from when the power ramping counter is greater than the maximum number of transmissions of Msg A by 1.
  • the value of the ramping step size may determine the transmission power for retransmission by applying the ramping step size for Msg 1 from a time when the power ramping counter becomes larger than the maximum number of transmissions of Msg A by 1.
  • the UE's fall-back and RLF operations for the value and maximum value of each counter may be applicable to NR as well as NR-U.
  • the UE transmits the Msg A PRACH preamble, there is a time interval greater than the minimum time required for the LBT before transmitting the Msg A PUSCH, and the transmission of the Msg A PRACH preamble and Msg A PUSCH is at a constant interval. Since the terminal is performed discontinuously, the UE performs LBT for both transmission of the Msg A PRACH preamble and the transmission of the Msg A PUSCH. Therefore, the operation of the terminal and the base station may differ differently depending on whether the LBT for the transmission time of each signal succeeds or fails.
  • the beam direction determined according to the channel state may also vary, and thus power setting for retransmission may also be complicated.
  • the operation of the terminal and the base station according to the failure time of the LBT for the transmission of the Msg A PRACH preamble and Msg A PUSCH and the transmission power setting will be described.
  • the configuration of the power ramping counter in the above case is that, since Msg A PRACH preamble and Msg A PUSCH are transmitted at regular intervals, the power ramping counter is shared and used in relation to the retransmission power setting of Msg A PRACH preamble and Msg A PUSCH.
  • a single counter, or dual counters used by configuring each power ramping counter for the retransmission power setting of Msg A PRACH preamble and Msg A PUSCH can be considered.
  • the maximum number of transmissions of Msg A is not commonly applied to the Msg A PRACH preamble and Msg A PUSCH, but the maximum number of transmissions for each of the Msg A PRACH preamble and Msg A PUSCH may be set.
  • a condition in which the value of the counter is increased or maintained may be the presence or absence of a change in a transmission space beam direction for Msg A PRACH preamble transmission when Msg A is retransmitted. That is, if the transmission spatial beam direction for Msg A PRACH preamble transmission is the same as the previous transmission, the counter value increases, and if the transmission spatial beam direction for Msg A PRACH preamble transmission is different from the previous transmission, the counter value is maintained. do.
  • the condition that the value of each counter increases or is maintained is in the transmission space beam direction compared to the previous transmission for Msg A PRACH preamble and Msg A PUSCH at the time of Msg A retransmission. It can be with or without change. That is, for Msg A PRACH preamble and Msg A PUSCH, if the transmission spatial beam direction for transmission of each signal is the same as the previous transmission, the value of each counter increases, and the transmission spatial beam direction for transmission of each signal is If it is different from the previous transmission, the value of each counter is maintained.
  • the term'retry' referred to in the present disclosure below means that the original RO cannot transmit the Msg A PRACH preamble due to the LBT failure, and the next RO transmits the Msg A PRACH preamble, or the original RO due to the LBT failure.
  • the case of transmitting another Msg A PRACH preamble from the originally scheduled RO does not mean'retry' mentioned in the present disclosure, and in this case, the value of the counter Again, it does not increase.
  • LBT failure and Msg A PUSCH transmission before Msg A PRACH preamble transmission The case of previous LBT failure can be divided and described.
  • the UE uses a single power ramping counter for Msg A PRACH preamble and Msg A PUSCH, if LBT fails before Msg A PRACH preamble transmission, the UE transmits Msg A PRACH preamble and Msg A PUSCH in succession.
  • a corresponding common power ramping counter value may be increased or maintained.
  • the value of each counter for Msg A PRACH preamble and Msg A PUSCH is It can be independently increased or maintained. In particular, if the transmission spatial beam direction set for transmission of each signal is the same as the previous transmission, the value of each counter increases, and the transmission spatial beam direction set for transmission of each signal If this is different from the previous transmission, the value of each counter is maintained.
  • the UE may continuously transmit Msg A or fall-back in a 4-step transmission of only Msg 1.
  • the operation of the terminal and the base station may vary according to each method.
  • the UE transmits Msg 1 using the preamble index for the 2-step RACH procedure, but the base station waits until the maximum transmission time of the Msg A PUSCH based on the detection time of Msg A (waiting), and the corresponding time In the case of the expiration, Msg 2 is transmitted in response to Msg 1 and a 4-step RACH procedure is performed.
  • the transmission power of Msg 1 may be set based on the setting of Msg 1 used in the 4-step RACH procedure, such as target received power for Msg 1.
  • the operation of the terminal may vary depending on whether the PO is set including a time interval for the LBT or whether the PO is set excluding the time interval for the LBT.
  • the terminal may perform the LBT within the time interval for the LBT and transmit the Msg A PUSCH at the same time when the LBT is successful, or the time for the corresponding LBT.
  • LBT is performed within the interval and LBT is successful
  • an arbitrary signal is transmitted up to the preset Msg A PUSCH start symbol for channel monopoly until the time when the original Msg A PUSCH is intended to be transmitted, and then Msg A PUSCH from the Msg A PUSCH start symbol. It can also be transmitted.
  • the terminal if the PO has been set excluding the time interval for the LBT, if the terminal does not succeed in LBT until the start symbol of the corresponding PO by performing the LBT before the corresponding PO, the terminal is in the next PO as in the embodiments described below.
  • the UE may transmit only the Msg A PUSCH in consideration of the fact that the Msg A PRACH preamble has already been transmitted.
  • the transmission time of the Msg A PUSCH is performed in the resource of the next PO when the Msg A PRACH preamble and the PO have a multiple to one mapping relationship or a one to one mapping relationship.
  • the resource for Msg A PUSCH transmission uses the same Msg A PUSCH resource associated with the RAPID used for the previous transmission.
  • Msg A PUSCH In order to distinguish whether the transmission of Msg A PUSCH is retransmission due to LBT failure at a previous time or an attempt to transmit Msg A PUSCH at the current time, Msg A PUSCH must be able to include information on retransmission, and the base station also corresponds Based on the information, it should be possible to convey through Msg B the number of responses to the previous RAPID.
  • the UE recognizes an attempt to transmit Msg A PUSCH due to LBT failure as retransmission, and according to the above-described embodiments for the case in which Msg A PRACH preamble and Msg A PUSCH are successively transmitted, the UE sets the transmission power of Msg A PUSCH. It is possible to increase or maintain the value of the power ramping counter for.
  • the UE transmits only the Msg A PUSCH by performing LBT before or within the plurality of POs. If channel estimation is possible between a plurality of POs, the value of the power ramping counter for Msg A PUSCH transmission power increases when the transmission space beam direction for Msg A PUSCH is the same as the previous transmission. It is maintained when the transmission spatial beam direction for the Msg A PUSCH is different from the previous transmission. In this case, when a dual power ramping counter is set for each of Msg A PRACH and Msg A PUSCH, the corresponding counter may indicate only a retransmission counter for Msg A PUSCH.
  • the UE may newly select and transmit the Msg A PRACH preamble for LBT failure prior to transmission of the Msg A PUSCH, and may transmit the Msg A PUSCH from a PO associated therewith.
  • information on Msg A PRACH preamble transmission must be delivered through the contents of Msg A PUSCH, through which the base station determines whether or not the current LBT has failed of the terminal, and the current transmission time of the terminal.
  • the terminal can select and transmit the Msg A PRACH preamble from the next RO, and the base station predicts a TA (Timing Advance) value based on the corresponding Msg A PRACH preamble.
  • reception of Msg A PUSCH can be expected.
  • the transmission power for the Msg A PRACH preamble is the value of the power ramping counter for the UE to set the transmission power of the Msg A PUSCH according to the above-described embodiments for the case where the Msg A PRACH preamble and the Msg A PUSCH are continuously transmitted. Can be allocated based on increasing or maintaining. If dual power ramping counters are used, whether the power ramping counter for each signal is increased or maintained may be configured differently depending on whether the transmission spatial beam direction for each of Msg A PRACH preamble and Msg A PUSCH is changed. .
  • the UE can also automatically predict a fallback to the 4-step RACH procedure because it has transmitted only the Msg A PRACH preamble, and expects information necessary for Msg 3 transmission to be received through Msg B. Thereafter, the terminal can receive Msg B and transmit Msg 3 using the information included therein.
  • the base station may use the PDCCH (DCI) of Msg 4 to designate a UE-specific resource for a PUCCH to be transmitted by the UE.
  • DCI PDCCH
  • the PDCCH for scheduling Msg 4 is set to DCI format 1_0 scrambling with TC-RNTI (Temporary Cell-Radio Network Temporary Identifier)
  • the DCI format 1_0 scrambled with RA-RNTI (Random Access-RNTI)
  • the following five DCI field elements excluding 1 bit for indicating the DCI format may be additionally indicated.
  • a PUCCH resource indicator of up to 3 bits and a PDSCH-to-HARQ_feedback timing indicator of 3 bits may be used for the indication of PUCCH resources.
  • the PDSCH-to-HARQ_feedback timing indicator is used to indicate the slot interval between the PDSCH including Msg 4 and the PUCCH including the HARQ-ACK to be transmitted by the UE, ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇
  • One of the values can be indicated. For example, if the last slot in which the PDSCH containing Msg 4 is received is #n, the PDSCH-to-HARQ_feedback timing indicator is one of ⁇ 0, 1, 2, 3, 4, 5, 6, 7 ⁇ Is indicated as a slot interval k, and the UE transmits a PUCCH including HARQ-ACK in slot #n+k.
  • a detailed indication method of the PDSCH-to-HARQ_feedback timing indicator is as follows.
  • the PUCCH resource indicator is used to indicate various parameters for setting PUCCH resources, and in dl-DataToUL-ACK SEQUENCE (SIZE (1..8)) OF INTEGER (0..15) of the upper layer parameter PUCCH-Config.
  • the mapped resource is used according to the bit for each bit.
  • the PUCCH resource indicator is 3 bits, and when indicating a specific set through RMSI (Remaining Minimum System Information) for two sets consisting of each of 8 resources, one PUCCH of the corresponding sets is set. Exists to do.
  • the 2-step RACH procedure may require a method of designating the PUCCH resource as a response to Msg B.
  • DCI or MAC Medium Access Control
  • a method of utilizing Msg B may be considered. Since a total of 16 PUCCH resources can be configured from index 0 to 15 for the PUCCH resource at any one point in time, when the base station transmits Msg B, Msg B must be configured and transmitted in consideration of the corresponding PUCCH resource.
  • the initial PUCCH resource index is designated as n and terminals are sequentially allocated from index n, each terminal may be cyclically allocated from index 0 to n if the PUCCH resource index exceeds 15. .
  • This method is a method of specifying a PUCCH resource to be used for HARQ-ACK transmission of the terminal by using only the DCI scheduling Msg B.
  • the base station indicates only the PDSCH-to-HARQ_feedback timing indicator through DCI and allows the terminal to calculate the PUCCH resource implicitly, or through the DCI, the PDSCH-to-HARQ_feedback timing indicator and the initial PUCCH resource index Alternatively, the PUCCH resource indicator may be explicitly indicated.
  • the base station may designate only the slot in which the PUCCH is to be transmitted by indicating the slot interval with the PDSCH-to-HARQ_feedback timing indicator among the DCI fields of Msg B. All UEs related to the corresponding Msg B transmit HARQ-ACK for Msg B reception in the designated slot through this PDSCH-to-HARQ_feedback timing indicator, and at this time, the PUCCH resource index is the index order of the MAC subheader. And can be sequentially mapped one-to-one.
  • a terminal detecting its RAPID and UE-ID in subheader #1 transmits HARQ-ACK through PUCCH resource index #1
  • a terminal detecting its RAPID and UE-ID in subheader #2 Transmits HARQ-ACK through PUCCH resource index #2. Since the UE can implicitly know the PUCCH resource index through its subheader index, the present method has the advantage of greatly reducing the signaling overhead of the base station.
  • the base station indicates the slot to which the PUCCH is to be transmitted by indicating the slot interval with the PDSCH-to-HARQ_feedback timing indicator among the DCI fields of Msg B, and may set the initial PUCCH resource index.
  • the base station directly indicates the PUCCH resource using 4 bits for the PUCCH resource index having a value of 0 to 15, or indirectly indicates the PUCCH resource using the PUCCH resource indicator similar to the 4-step RACH procedure. May be.
  • PUCCH resource indexes #0 to 15 are sequentially allocated unconditionally, but in this method, the base station designates the initial value of the PUCCH resource index, and the terminal is designated. Based on the index of the initial value, the index of the MAC subheader is sequentially mapped one-to-one to receive the PUCCH resource index.
  • the UE detecting its RAPID and UE-ID in #1 subheader of Msg B transmits HARQ-ACK through PUCCH resource index #15,
  • the UE that detects its RAPID and UE-ID in #2 subheader transmits HARQ-ACK through PUCCH resource index #0.
  • the UE that detects its RAPID and UE-ID in #3 subheader transmits HARQ-ACK through PUCCH resource index #1.
  • an unusable PUCCH resource index may be additionally indicated by using bits or bitmaps corresponding to the PUCCH resource index. That is, a PUCCH resource indicator (PRI) is sequentially allocated to the UE in the order of a MAC Protocol Data Unit (PDU), but a portion having a value of '0' among the additionally indicated bitmaps may be omitted and the PRI may be allocated.
  • PRI PUCCH resource indicator
  • the terminal detecting its RAPID and UE-ID in #2 subheader of Msg B has the second bit value of the above bitmap. Because it is '0', PUCCH resource index #2 is omitted and HARQ-ACK is transmitted through PUCCH resource index #3, and the UE detecting its RAPID and UE-ID in subheader #3 is through PUCCH resource index #4. HARQ-ACK is transmitted.
  • This method is for setting a PDSCH-to-HARQ_feedback timing indicator (3 bits) and a PUCCH resource index (4 bits) or a PUCCH resource indicator (3 bits) for each terminal when the base station transmits the MAC Msg B (success RAR).
  • This is a method of explicitly indicating 6-bit or 7-bit information through Msg B (success RAR).
  • a PUCCH transmission resource is indicated by a 4-bit PUCCH resource related indication field in successRAR, and a 3-bit PDSCH in successRAR PUCCH transmission resources may be indicated by the -to-HARQ feedback timing indication field.
  • the size of the MsgB increases as the MsgB (success RAR) contains a plurality of pieces of information, but the base station has the advantage of being able to specify the PUCCH resource of each terminal with full flexibility. have.
  • This method uses both DCI and MAC Msg B (success RAR) in a way that takes advantage of the above-described methods (1) and (2), excluding the extremes.
  • the method may have various embodiments as follows depending on which information of the PDSCH-to-HARQ_feedback timing indicator and parameters such as a PUCCH resource index or a PUCCH resource indicator is transmitted through which information among DCI and MAC Msg B (success RAR).
  • PDSCH-to-HARQ_feedback timing indicator (3 bits) and PUCCH resource index (4 bits) or PUCCH resource indicator (3 bits) are included in DCI, and the PUCCH resource offset value of 1 bit or 2 bits is MAC Msg B You can consider being included in the (success RAR) and delivered.
  • the PDSCH-to-HARQ_feedback timing indicator parameter is basically transmitted by DCI, which increases signaling overhead, but it can be compensated by specifying a PUCCH resource offset value for each terminal in MAC Msg B (success RAR). have.
  • the PUCCH resource index or the PUCCH resource indicator is also transmitted by DCI, so that the initial PUCCH resource index can be designated as in the above-described methods.
  • the offset value indicated by MAC Msg B (success RAR) may be N bits, and the offset may be used in the following ways.
  • the offset indicated by MAC Msg B may be applied and utilized for the original UE's own PRI value. That is, the UE may transmit HARQ-ACK through a PUCCH resource corresponding to a PRI value to which an offset value is applied based on its own PRI index.
  • the UE Based on the initial PUCCH resource index designated through DCI, the UE is sequentially assigned its own PUCCH resource index according to the subheader index of MAC Msg B (success RAR), and the UE receives MAC Msg B (success RAR). If the offset is indicated through the UE transmits the HARQ-ACK in the PUCCH resource of the index increased or decreased by the corresponding offset value.
  • the offset value indicates a value of ⁇ +2, +1, -1, -2 ⁇ , a value of ⁇ +4, +3, +2, +1 ⁇ , or Values of ⁇ -4, -3, -2, -1 ⁇ can be indicated.
  • the UE that detects its RAPID and UE-ID in the K-th subheader is originally assigned the PUCCH resource index #M+K, and if the value of #M+K is greater than 15, the cyclic shift It means that a value according to is allocated, and the UE transmits HARQ-ACK in the PUCCH resource of the #M+K+a or #M+Ka index by applying the offset value a as described above.
  • the offset indicated by MAC Msg B may be applied and utilized based on the location of the previous terminal. That is, in a state in which the accumulated offsets for previous terminals are applied as they are, the PUCCH resource to be used may be determined by additionally applying an offset indicated for the MAC subheader of the terminal itself.
  • the initial PUCCH resource index is #M
  • the first terminal that detects its RAPID and UE-ID through the first subheader receives an offset of 3
  • the corresponding first terminal is #M+3.
  • HARQ-ACK is transmitted in the PUCCH resource of the index.
  • the second terminal which has detected its RAPID and UE-ID through the second subheader, receives an offset of 2
  • the second terminal accumulates and applies the offset value 3 applied to the first terminal.
  • #M+3+2 HARQ-ACK is transmitted in the PUCCH resource.
  • each PRI for indicating the PUCCH resource index (4 bits) or the PUCCH resource indicator (3 bits) is MAC Msg B ( success RAR).
  • a common PUCCH transmission slot is transmitted through DCI, and a PUCCH resource index or a PUCCH resource indicator for each terminal is designated to be terminal-specific (UE specific) through MAC Msg B (success RAR).
  • signaling overhead may be increased compared to the above-described method of indicating an offset in a success RAR (MSg B), but flexibility in indicating a PUCCH resource of a base station may be increased.
  • PUCCH resource index (4 bits) or PUCCH resource indicator (3 bits) is included in DCI, and each PDSCH-to-HARQ_feedback timing indicator (3 bits) is in MAC Msg B (success RAR). You can consider what to include.
  • the time (slot) setting of each PUCCH resource is differently classified. That is, when the base station designates a DCI common PUCCH resource index and uses the PUCCH resource according to the corresponding index, or if the information of the PUCCH resource index is not included in the DCI, all terminals initially use the PUCCH resource according to the PUCCH resource index #0. , Each UE transmits a PUCCH through a corresponding slot with reference to a slot timing determined according to information included in MAC Msg B (success RAR).
  • the UE and the base station transmit and receive RACH configuration information for performing a 2-step RACH procedure, and the information includes a power ramping step size and/or a ramping counter, a transmission beam, or Information related to embodiments of the present disclosure, such as a spatial filter, may also be included (S2101).
  • the base station may transmit RACH configuration information using a synchronization signal block (SSB) such as a master information block (MIB) and a system information block (SIB), and/or RRC signaling.
  • SSB synchronization signal block
  • MIB master information block
  • SIB system information block
  • the step S2101 may be omitted in the case of a terminal that has established a connection state, such as a terminal that has already received the above RACH configuration information or a terminal that reconnects to a base station that has transmitted the RACH configuration information. . Since the UEs have already obtained RACH Configuration information, a corresponding step may be omitted for these UEs to reduce a processing delay due to redundant transmission and reception of previously received RACH Configuration information.
  • the terminal in step S2101 described above may be the first wireless device 100 of FIG. 22 or the wireless devices 100 and 200 of FIG. 23, and the base station is the second wireless device 200 of FIG. 22 or the wireless device of FIG. 23. It may be (100, 200). That is, the step S1501 in which the terminal receives RACH configuration information from the base station may be implemented by various wireless devices of FIGS. 22 to 25 to be described later.
  • the processor 102 of FIG. 22 may control one or more transceivers 106 and/or one or more memories 104 to receive the RACH configuration information.
  • the one or more transceivers 106 may receive the RACH Configuration information from the base station.
  • the UE can acquire information about Msg A based on the RACH configuration received from the base station, and according to the acquired information, RACH Occasion (RO)/Preamble and PUSCH Occasion (PO)/PUSCH resource unit Msg A for performing a 2-step RACH procedure by selecting (PRU) may be transmitted to the base station (S2103).
  • the terminal may transmit Msg A based on a ramping step size for setting the transmission power of Msg A and/or a counter, a transmission beam, or a spatial filter related to the embodiments of the present disclosure.
  • the terminal in step S2103 described above may be the first wireless device 100 of FIG. 22 or the wireless devices 100 and 200 of FIG. 23, and the base station is the second wireless device 200 of FIG. 22 or the wireless device of FIG. 23. It may be (100, 200). That is, the step S2103 in which the terminal transmits Msg A to the base station may be implemented by various wireless devices of FIGS. 22 to 25 to be described later.
  • the processor 102 of FIG. 22 may control one or more transceivers 106 and/or one or more memories 104 to transmit the Msg A, The one or more transceivers 106 may transmit the Msg A to the base station.
  • the RO in the 2-step RACH procedure considers the RO allocated for the 4-step RACH procedure, i) the 2-step RACH procedure and the 4-step RACH procedure Independent RO and preamble are set for each, ii) share the same RO for 2-step RACH Procedure and 4-step RACH Procedure, but preamble is set separately, or iii) 2-step RACH Procedure and 4-step It can be configured to share the same RO and preamble for RACH Procedure.
  • a PRU for transmission of Msg A PUSCH may be defined in consideration of PO, DMRS port, and DMRS sequence, and PO is a time-frequency for payload transmission. It can be defined as a resource.
  • the PO for the PUSCH of Msg A may be set separately from the RO, or may be set as a relative time and/or frequency position in consideration of the associated RO, and one or more PO(s) may be set within the setting period of the Msg A PUSCH. I can.
  • the PRACH and PUSCH included in Msg A may be time division multiplexed (TDM) and transmitted in different slots, or PRACH and PUSCH may be transmitted in the same slot. May be.
  • the Msg A PUSCH may be continuously transmitted on the time domain with the Msg A PRACH or may be transmitted with a specific gap.
  • the PRACH and PUSCH included in Msg A are i) transmitted using the same beam or a spatial filter, or ii) according to the decision of the terminal. It may be transmitted using the same or different beam or spatial filter, or iii) transmitted using a beam or spatial filter set by the base station.
  • the terminal may set a random access response (RAR) window for monitoring Msg B after Msg A is transmitted.
  • RAR random access response
  • the terminal in order to record the number of retries of the 2-step RACH procedure, the terminal may set a retransmission counter of Msg A, and the maximum value of the counter may be set by the base station or the network.
  • the base station may detect the preamble of the Msg A PRACH and decode the payload/data of the Msg A PUSCH and process it. If the base station does not detect the preamble of the Msg A PRACH, the base station may not deliver any information to the terminal.
  • step S2103 in which the terminal transmits Msg A to the base station embodiments of the present disclosure may be appropriately applied.
  • the transmission power for the Msg A may be set or indicated based on the method in the embodiments of the present disclosure described above.
  • the terminal that has transmitted Msg A may then receive Msg B (S2105).
  • Msg B may be scheduled through a PDCCH corresponding to the DMRS and transmitted through a PDSCH corresponding to the DMRS.
  • Information (contents) included in Msg B may vary according to a result of decoding and processing of Msg A PUSCH.
  • Msg B is a success RAR and a contention resolution identifier such as a UE identifier transmitted by the UE as a Common Control Channel (CCCH) Service Data Unit (SDU)
  • CCCH Common Control Channel
  • SDU Service Data Unit
  • Msg B is a fallback RAR and includes RAPID and uplink grant (UL grant) information for retransmission of the PUSCH of Msg A.
  • the base station transmits a fallback RAR through Msg B the UE having successfully decoded the RAPID and UL grant included in Msg B may fall-back with a 4-step RACH procedure.
  • the terminal in step S2105 described above may be the first wireless device 100 of FIG. 22 or the wireless devices 100 and 200 of FIG. 23, and the base station is the second wireless device 200 of FIG. 22 or the wireless device of FIG. 23. It may be (100, 200). That is, the step S2105 in which the terminal receives Msg B from the base station may be implemented by various wireless devices of FIGS. 22 to 25 to be described later.
  • the processor 102 of FIG. 22 may control one or more transceivers 106 and/or one or more memories 104 to receive the Msg B, The one or more transceivers 106 may receive the Msg B to the base station.
  • the UE may take the same or similar operation as the operation after the UE performing the existing 4-step RACH procedure receives Msg 4 according to whether Msg B is decoded and received. If the terminal successfully receives Msg B in the RAR window, the terminal may determine that the 2-step RACH procedure has been successful. Or, when the UE receives the fallback RAR, the UE may perform the Msg 3 transmission procedure on the 4-step RACH Procedure based on information included in Msg B such as UL grant.
  • retransmission of Msg A may mean retransmission of Msg A PRACH including reselection of preamble and retransmission of Msg A PUSCH. If the transmission beam or spatial filter for retransmission of the Msg A PRACH is different from the transmission beam or spatial filter of the recently transmitted Msg A PRACH, the power ramping counter of the Msg A PRACH may not increase.
  • the embodiments related to the 2-step RACH procedure of the present disclosure described above may be applied even in the RRC_INACTIVE, RRC_CONNECTED, and RRC_IDLE states, and may be configured as a general Medium Access Control (MAC) procedure.
  • MAC Medium Access Control
  • embodiments related to the 2-step RACH procedure of the above-described disclosure may not be exceptionally applied to the system information (SI) request and/or the beam failure recovery (BFR) procedure.
  • SI system information
  • BFR beam failure recovery
  • an operation for re-performing the existing 4-step RACH procedure in consideration of fall-back in the above-described 2-step RACH procedure may be configured.
  • the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR).
  • ⁇ the first wireless device 100, the second wireless device 200 ⁇ is the ⁇ wireless device 100x, the base station 200 ⁇ and/or ⁇ wireless device 100x, wireless device 100x) of FIG. 2 ⁇ Can be matched.
  • the first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108.
  • the processor 102 controls the memory 104 and/or the transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed herein.
  • the processor 102 may process information in the memory 104 to generate first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106.
  • the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106.
  • the memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 may perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed herein. It is possible to store software code including:
  • the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement a wireless communication technology (eg, LTE, NR).
  • the transceiver 106 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108.
  • Transceiver 106 may include a transmitter and/or a receiver.
  • the transceiver 106 may be mixed with an RF (Radio Frequency) unit.
  • the wireless device may mean a communication modem/circuit/chip.
  • the following operations are described based on the control operation of the processor 102 from the perspective of the processor 102, but may be stored in the memory 104 in software code or the like for performing these operations.
  • the processor 102 may control the transceiver 106 to transmit a message A including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH).
  • the processor 102 may control the transceiver 106 to receive a message B related to contention resolution in response to the message A.
  • a specific method of controlling the transceiver 106 so that the processor 102 transmits the message A and the transceiver 106 to receive the message B may be based on the above-described embodiments.
  • the following operations are described based on the control operation of the processor 202 from the perspective of the processor 202, but may be stored in the memory 204, such as software code for performing these operations.
  • the processor 202 may control the transceiver 206 to receive a message A including a first physical random access channel (PRACH) and a first physical uplink shared channel (PUSCH).
  • the processor 202 may control the transceiver 206 to transmit a message B related to contention resolution in response to the message A.
  • a specific method of controlling the transceiver 206 to receive the message A by the processor 202 and the transceiver 206 to transmit the message B may be based on the above-described embodiments.
  • one or more protocol layers may be implemented by one or more processors 102, 202.
  • one or more processors 102 and 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP).
  • One or more processors 102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated.
  • PDUs Protocol Data Units
  • SDUs Service Data Units
  • One or more processors 102, 202 may generate messages, control information, data, or information according to the description, function, procedure, proposal, method, and/or operational flow chart disclosed herein. At least one processor (102, 202) generates a signal (e.g., a baseband signal) containing PDU, SDU, message, control information, data or information according to the functions, procedures, proposals and/or methods disclosed in this document. , Can be provided to one or more transceivers (106, 206).
  • a signal e.g., a baseband signal
  • One or more processors 102, 202 may receive signals (e.g., baseband signals) from one or more transceivers 106, 206, and the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein PDUs, SDUs, messages, control information, data, or information may be obtained according to the parameters.
  • signals e.g., baseband signals
  • One or more of the processors 102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer.
  • One or more of the processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • the description, functions, procedures, suggestions, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like.
  • the description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are configured to perform firmware or software included in one or more processors 102, 202, or stored in one or more memories 104, 204, and It may be driven by the above processors 102 and 202.
  • the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions, and/or sets of instructions.
  • One or more memories 104, 204 may be connected to one or more processors 102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions and/or instructions.
  • One or more of the memories 104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, registers, cache memory, computer readable storage media, and/or combinations thereof.
  • One or more memories 104 and 204 may be located inside and/or outside of one or more processors 102 and 202.
  • one or more memories 104, 204 may be connected to one or more processors 102, 202 through various technologies such as wired or wireless connection.
  • One or more transceivers 106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices.
  • One or more transceivers (106, 206) may receive user data, control information, radio signals/channels, etc., mentioned in the description, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document from one or more other devices. have.
  • one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and may transmit and receive wireless signals.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or radio signals to one or more other devices.
  • one or more processors 102, 202 may control one or more transceivers 106, 206 to receive user data, control information, or radio signals from one or more other devices.
  • one or more transceivers (106, 206) may be connected to one or more antennas (108, 208), one or more transceivers (106, 206) through the one or more antennas (108, 208), the description and functions disclosed in this document.
  • one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports).
  • One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. It can be converted into a baseband signal.
  • One or more transceivers 106 and 206 may convert user data, control information, radio signals/channels, etc. processed using one or more processors 102 and 202 from a baseband signal to an RF band signal.
  • one or more of the transceivers 106 and 206 may include (analog) oscillators and/or filters.
  • the wireless device may be implemented in various forms according to use-examples/services (see FIG. 22).
  • the wireless devices 100 and 200 correspond to the wireless devices 100 and 200 of FIG. 22, and various elements, components, units/units, and/or modules ).
  • the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140.
  • the communication unit may include a communication circuit 112 and a transceiver(s) 114.
  • the communication circuit 112 may include one or more processors 102 and 202 and/or one or more memories 104 and 204 of FIG. 22.
  • the transceiver(s) 114 may include one or more transceivers 106 and 206 and/or one or more antennas 108 and 208 of FIG. 22.
  • the control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140 and controls all operations of the wireless device. For example, the control unit 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130. In addition, the control unit 120 transmits the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or externally through the communication unit 110 (eg, Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130.
  • an external eg, other communication device
  • the specific operation process of the control unit 120 and the program/code/command/information stored in the memory unit 130 according to the present invention are at least one of the processors 102 and 202 of FIG. 22 and the memory 104 and 204. ) May correspond to at least one of the operations.
  • the additional element 140 may be configured in various ways depending on the type of wireless device.
  • the additional element 140 may include at least one of a power unit/battery, an I/O unit, a driving unit, and a computing unit.
  • wireless devices include robots (FIGS. 2, 100a), vehicles (FIGS. 2, 100b-1, 100b-2), XR devices (FIGS. 2, 100c), portable devices (FIGS. 2, 100d), and home appliances.
  • Fig. 2, 100e) IoT device (Fig. 2, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environment device, It may be implemented in the form of an AI server/device (FIGS. 2 and 400), a base station (FIGS. 2 and 200), and a network node.
  • the wireless device can be used in a mobile or fixed place depending on the use-example/service.
  • various elements, components, units/units, and/or modules in the wireless devices 100 and 200 may be entirely interconnected through a wired interface, or at least some may be wirelessly connected through the communication unit 110.
  • the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130, 140) are connected through the communication unit 110.
  • the control unit 120 and the first unit eg, 130, 140
  • each element, component, unit/unit, and/or module in the wireless device 100 and 200 may further include one or more elements.
  • the control unit 120 may be configured with one or more processor sets.
  • control unit 120 may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphic processing processor, and a memory control processor.
  • memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory. volatile memory) and/or a combination thereof.
  • FIG. 23 An implementation example of FIG. 23 will be described in more detail with reference to the drawings.
  • Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), and portable computers (eg, notebook computers).
  • the portable device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS advanced mobile station
  • WT wireless terminal
  • the portable device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input/output unit 140c. ) Can be included.
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of FIG. 23, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations.
  • the controller 120 may perform various operations by controlling components of the portable device 100.
  • the controller 120 may include an application processor (AP).
  • the memory unit 130 may store data/parameters/programs/codes/commands required for driving the portable device 100.
  • the memory unit 130 may store input/output data/information, and the like.
  • the power supply unit 140a supplies power to the portable device 100 and may include a wired/wireless charging circuit, a battery, and the like.
  • the interface unit 140b may support connection between the portable device 100 and other external devices.
  • the interface unit 140b may include various ports (eg, audio input/output ports, video input/output ports) for connection with external devices.
  • the input/output unit 140c may receive or output image information/signal, audio information/signal, data, and/or information input from a user.
  • the input/output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.
  • the input/output unit 140c acquires information/signals (eg, touch, text, voice, image, video) input from the user, and the obtained information/signals are stored in the memory unit 130. Can be saved.
  • the communication unit 110 may convert the information/signal stored in the memory into a wireless signal, and may directly transmit the converted wireless signal to another wireless device or to a base station.
  • the communication unit 110 may restore the received radio signal to the original information/signal.
  • the restored information/signal is stored in the memory unit 130, it may be output in various forms (eg, text, voice, image, video, heptic) through the input/output unit 140c.
  • the vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), a ship, or the like.
  • AV aerial vehicle
  • the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit. It may include a unit (140d).
  • the antenna unit 108 may be configured as a part of the communication unit 110.
  • Blocks 110/130/140a to 140d correspond to blocks 110/130/140 of FIG. 23, respectively.
  • the communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, roadside base stations, etc.), and servers.
  • the controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100.
  • the control unit 120 may include an Electronic Control Unit (ECU).
  • the driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground.
  • the driving unit 140a may include an engine, a motor, a power train, a wheel, a brake, a steering device, and the like.
  • the power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100, and may include a wired/wireless charging circuit, a battery, and the like.
  • the sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like.
  • the sensor unit 140c is an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle advancement. /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illuminance sensor, pedal position sensor, etc. can be included.
  • the autonomous driving unit 140d is a technology that maintains a driving lane, a technology that automatically adjusts the speed such as adaptive cruise control, a technology that automatically travels along a predetermined route, and automatically sets a route when a destination is set. Technology, etc. can be implemented.
  • the communication unit 110 may receive map data, traffic information data, and the like from an external server.
  • the autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data.
  • the controller 120 may control the driving unit 140a so that the vehicle or the autonomous vehicle 100 moves along the autonomous driving path according to the driving plan (eg, speed/direction adjustment).
  • the communication unit 110 asynchronously/periodically acquires the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles.
  • the sensor unit 140c may acquire vehicle status and surrounding environment information.
  • the autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data/information.
  • the communication unit 110 may transmit information about a vehicle location, an autonomous driving route, a driving plan, and the like to an external server.
  • the external server may predict traffic information data in advance using AI technology or the like, based on information collected from the vehicle or autonomously driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomously driving vehicles.
  • the wireless communication technology implemented in the wireless device of the present specification may include LTE, NR, and 6G as well as NB-IoT (Narrowband Internet of Things) for low power communication.
  • the NB-IoT technology may be an example of LPWAN (Low Power Wide Area Network) technology, and may be implemented in standards such as LTE Cat (Category) NB1 and/or LTE Cat NB2, and It is not limited.
  • the wireless communication technology implemented in the wireless device of the present specification may perform communication based on the LTE-M technology.
  • the LTE-M technology may be an example of an LPWAN technology, and may be referred to by various names such as enhanced machine type communication (eMTC).
  • eMTC enhanced machine type communication
  • LTE-M technology is 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-Bandwidth Limited (BL), 5) LTE-MTC, 6) LTE Machine Type Communication, and/or 7) may be implemented in at least one of various standards such as LTE M, and is not limited to the above-described name.
  • the wireless communication technology implemented in the wireless device of the present specification includes at least one of ZigBee, Bluetooth, and Low Power Wide Area Network (LPWAN) in consideration of low power communication. It can be, and is not limited to the above-described name.
  • ZigBee technology can create personal area networks (PANs) related to small/low-power digital communication based on various standards such as IEEE 802.15.4, and may be referred to by various names.
  • PANs personal area networks
  • a specific operation described as being performed by a base station in this document may be performed by its upper node in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network comprising a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station.
  • the base station may be replaced by terms such as a fixed station, gNode B (gNB), Node B, eNode B (eNB), and access point.

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Abstract

L'invention concerne un procédé d'émission et de réception de signaux pour permettre à un terminal d'exécuter une procédure de canal d'accès aléatoire (procédure RACH) dans une bande sans licence. En particulier, le procédé consiste à : émettre un signal de liaison montante comprenant un premier canal d'accès aléatoire physique (PRACH) et un premier canal partagé de liaison montante physique (PUSCH) vers une station de base ; et recevoir, depuis la station de base, un signal de liaison descendante relatif à la résolution de conflits en réponse au signal de liaison montante, un compteur d'augmentation de puissance étant utilisé pour régler la puissance d'émission du signal de liaison montante, et la valeur du compteur d'augmentation de puissance pouvant être augmentée sur la base d'un faisceau spatial d'émission pour l'émission du signal de liaison montante qui est conçu de la même manière qu'un faisceau spatial d'émission pour l'émission d'un PRACH avant le signal de liaison montante.
PCT/KR2020/013074 2019-09-25 2020-09-25 Procédé d'émission et de réception de signaux pour l'exécution d'un procédé d'accès aléatoire dans une bande sans licence, et appareil associé WO2021060916A1 (fr)

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CN202080067430.9A CN114531969A (zh) 2019-09-25 2020-09-25 用于发送和接收用于在免授权频带中执行随机接入过程的信号的方法及其设备
EP20869904.1A EP4050960A4 (fr) 2019-09-25 2020-09-25 Procédé d'émission et de réception de signaux pour l'exécution d'un procédé d'accès aléatoire dans une bande sans licence, et appareil associé
KR1020227013779A KR102557584B1 (ko) 2019-09-25 2020-09-25 비면허 대역에서 임의 접속 과정을 수행하기 위한 신호를 송수신하는 방법 및 이를 위한 장치
US17/704,868 US11638310B2 (en) 2019-09-25 2022-03-25 Method for transmitting and receiving signals for performing random access process in unlicensed band, and apparatus therefor
US18/166,850 US11844118B2 (en) 2019-09-25 2023-02-09 Method for transmitting and receiving signals for performing random access process in unlicensed band, and apparatus therefor

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KR20190118400 2019-09-25
KR10-2019-0118400 2019-09-25
KR20190120136 2019-09-27
KR10-2019-0120136 2019-09-27

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HUAWEI, HISICION: "timers and counters for two-steps RACH", 3GPP DRAFT; R2-1816604 TIMERS AND COUNTERS FOR TWO-STEP RACH_REVISED, vol. RAN WG2, 2 November 2018 (2018-11-02), Spokane, USA, pages 1 - 2, XP051480550 *
INTEL CORPORATION: "Enhancements to initial access and mobility for NR-unlicensed", 3GPP DRAFT; R1-1808686-INTEL-ENHANCEMENTS TO INITIAL ACCESS AND MOBILITY FOR NR-UNLICENSED, vol. RAN WG1, 11 August 2018 (2018-08-11), Gothenburg, Sweden, pages 1 - 4, XP051516061 *
NOKIA, NOKIA SHANGHAI BELL: "On 2-step RACH Procedure", 3GPP DRAFT; R1-1904716, vol. RAN WG1, 12 April 2019 (2019-04-12), Xi'an China, pages 1 - 16, XP051691709 *
See also references of EP4050960A4
ZTE, SANECHIPS: "Further discussions on 2-step RACH procedures", 3GPP DRAFT; R1-1905990 FURTHER DISCUSSIONS ON 2-STEP RACH PROCEDURES-FINAL, vol. RAN WG1, 3 May 2019 (2019-05-03), Reno USA, pages 1 - 13, XP051708032 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024014756A1 (fr) * 2022-07-15 2024-01-18 엘지전자 주식회사 Procédé et dispositif de transmission et de réception en liaison montante dans un système de communication sans fil

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US20220217789A1 (en) 2022-07-07
US11844118B2 (en) 2023-12-12
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EP4050960A4 (fr) 2023-10-25
CN114531969A (zh) 2022-05-24

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